Question: Death at the Dolphin is a detective novel by Ngaio Marsh; it is the twenty-fourth novel to feature Roderick Alleyn, and was first published in 1967, the plot centers on a glove once owned by Hamnet Shakespeare, Hamnet  was the only son of William Shakespeare and Anne Hathaway, and the fraternal twin of who?

full_context: Document 1: Enter a Murderer: Enter a Murderer is a detective novel by Ngaio Marsh; it is the second novel to feature Roderick Alleyn, and was first published in 1935. The novel is the first of the theatrical novels for which Marsh was to become famous, taking its title from a line of stage direction in "Macbeth", and the plot concerns the on-stage murder of an actor who has managed to antagonize nearly every member of the cast and crew. Unfortunately for the murderer, Inspector Alleyn is in the audience.
Document 2: Susanna Hall: Susanna Hall ("née" Shakespeare; baptised 26 May 1583 – 11 July 1649) was the oldest child of William Shakespeare and Anne Hathaway, and the older sister of Judith Quiney and Hamnet Shakespeare. She married John Hall, a local physician, in 1607. They had one daughter, named Elizabeth, in 1608. Elizabeth married Thomas Nash, son of Anthony Nash on 22 April, 1626 at Holy Trinity Church, Stratford-upon-Avon.
Document 3: Death at the Dolphin: Death at the Dolphin is a detective novel by Ngaio Marsh; it is the twenty-fourth novel to feature Roderick Alleyn, and was first published in 1967. The plot centers on a glove once owned by Hamnet Shakespeare, on display at a newly renovated theater called the Dolphin; the novel was published as "Killer Dolphin" in the United States. Several characters from the novel return in Marsh's final book, "Light Thickens".
Document 4: Sonnet 110: Sonnet 110 is one of 154 sonnets written by the English playwright and poet William Shakespeare. Sonnet 110 was published along with the other sonnets in the 1609 Quarto. The sonnet falls in place with the Fair Youth sequence of Shakespeare's sonnets, in which the poet expresses his love towards a young man. The mystery of the young man is still unknown today. However, there are many different theories by various scholars of who this young man may be. There has been much debate whether or not this sonnet was written about Shakespeare's disdain with the stage and actors. Whereas others have interpreted sonnet 110 as the poet confessing his love to a young man.
Document 5: Last Ditch: Last Ditch is a detective novel by Ngaio Marsh; it is the twenty-ninth novel to feature Roderick Alleyn, and was first published in 1977. The plot concerns drug smuggling in the Channel Islands, and features Alleyn's son, Ricky, in a central role.
Document 6: A Man Lay Dead: A Man Lay Dead is a detective novel by Ngaio Marsh; it is the first novel to feature Roderick Alleyn, and was first published in 1934. The plot concerns a murder committed during a detective game of murder at a weekend party in a country house. Although there is a side-plot focused on Russians, ancient weapons, and secret societies, the murder itself concerns a small group of guests at Sir Hubert Handesley's estate. The guests include Sir Hubert's niece (Angela North), Charles Rankin (a 46- or 47-year-old man about town), Nigel Bathgate (Charles's cousin and a gossip reporter), Rosamund Grant, and Mr and Mrs Arthur Wilde. Also in attendance are an art expert and a Russian butler. Unlike later novels, this novel is more focused on Nigel Bathgate and less so on Alleyn.
Document 7: Light Thickens: Light Thickens is a detective novel by Ngaio Marsh; it is the thirty-second, and final, novel to feature Roderick Alleyn, and was first published in 1982. The plot concerns the murder of the lead actor in a production of "Macbeth" in London, and the novel takes its title from a line in the play. A number of characters in the book appeared previously in Marsh's novel "Death at the Dolphin". The novel is dedicated to the actors James Laurenson and Helen Thomas who had played Macbeth and Lady Macbeth respectively in the author's 1962 production of the play, which she had previously directed, also for The Canterbury University Players, in 1946.
Document 8: Vintage Murder: Vintage Murder is a detective novel by Ngaio Marsh; it is the fifth novel to feature Roderick Alleyn, and was first published in 1937. The plot centers on a traveling theatrical troupe in New Zealand. One of the cast members was a minor character in "Enter a Murderer", and refers to that case early in the story.
Document 9: Judith Quiney: Judith Quiney (baptised 2 February 1585 – 9 February 1662), "née" Shakespeare, was the younger daughter of William Shakespeare and Anne Hathaway and the fraternal twin of Shakespeare's only son Hamnet Shakespeare. She married Thomas Quiney, a vintner of Stratford-upon-Avon. The circumstances of the marriage, including Quiney's misconduct, may have prompted the rewriting of Shakespeare's will. Thomas was struck out, while Judith's inheritance was attached with provisions to safeguard it from her husband. The bulk of Shakespeare's estate was left, in an elaborate fee tail, to his elder daughter Susanna and her male heirs.
Document 10: Overture to Death: Overture to Death is a detective novel by Ngaio Marsh; it is the eighth novel to feature Roderick Alleyn, and was first published in 1939. The plot concerns a murder during a village theatrical performance; Sergei Rachmaninoff's "Prelude in C-sharp minor" plays a prominent part in the story. So does a "Venetian Suite" by Ethelbert Nevin. The murder weapon is a pistol hidden in a piano.
Document 11: Anne Hathaway's Cottage: Anne Hathaway's Cottage is a twelve-roomed farmhouse where Anne Hathaway, the wife of William Shakespeare, lived as a child in the village of Shottery, Warwickshire, England, about 1 mi west of Stratford-upon-Avon. Spacious, and with several bedrooms, it is now set in extensive gardens.
Document 12: Hamnet Shakespeare: Hamnet Shakespeare (baptised 2 February 1585 – buried 11 August 1596) was the only son of William Shakespeare and Anne Hathaway, and the fraternal twin of Judith Shakespeare. He died at age 11. Some Shakespearean scholars speculate on the relationship between Hamnet and his father's later play "Hamlet", as well as on possible connections between Hamnet's death and the writing of "King John", "Romeo and Juliet", "Julius Caesar", and "Twelfth Night".
Document 13: Richard Hathwaye: Richard Hathwaye (fl. 1597–1603), was an English dramatist. Little is known about Hathwaye's life. There is no evidence that he was related to his namesake Richard Hathaway, the father of Shakespeare's wife, Anne Hathaway, though his wife Joan is from Leek Wootton Warwickshire only 16.5 kilometers from Stratford Upon Avon. Hathwaye is not heard of after 1603 and died in 1604.
Document 14: Died in the Wool: Died in the Wool is a detective novel by Ngaio Marsh; it is the thirteenth novel to feature Roderick Alleyn, and was first published in 1945. The novel concerns the murder of a New Zealand parliamentarian on a remote sheep farm on the Canterbury Region of the South Island of New Zealand, said to be located in Mackenzie country near Aoraki/Mount Cook (which in the novel is referred to as the "Cloud-Piercer", the highest in a series of several peaks surrounding the high plateau where most of the action occurs). Like the previous novel in the series ("Colour Scheme") the story takes place during World War II with Alleyn doing counter-espionage work. The format of the book is somewhat unusual, in that Alleyn does not arrive at the scene of the murder until fifteen months after it has taken place, and much of his detecting is founded upon stories told him by the chief witnesses in the case.
Document 15: Shakespeare's life: William Shakespeare was an actor, playwright, poet, and theatre entrepreneur in London during the late Elizabethan and early Jacobean eras. He was baptised on 26 April 1564 in Stratford-upon-Avon in Warwickshire, England, in the Holy Trinity Church. At age 18 he married Anne Hathaway with whom he had three children. He died in his home town of Stratford on 23 April 1616 at the age of 52. Though more is known about Shakespeare's life than those of most other Elizabethan and Jacobean writers, few personal biographical facts survive about him, which is unsurprising in the light of his social status as a commoner, the low esteem in which his profession was held, and the general lack of interest of the time in the personal lives of writers. Information about his life derives from public instead of private documents: vital records, real estate and tax records, lawsuits, records of payments, and references to Shakespeare and his works in printed and hand-written texts. Nevertheless, hundreds of biographies have been written and more continue to be, most of which rely on inferences and the historical context of the 70 or so hard facts recorded about Shakespeare the man, a technique that sometimes leads to embellishment or unwarranted interpretation of the documented record.
ground_truth: Judith Shakespeare