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?
Sentence (from "Hamnet Shakespeare"): 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".
Relevant evidence: No