Question: The father of Tamasin Day-Lewis wrote mystery stories under what pseudonym?

Context articles: The Best American Mystery Stories
Miranda Shearer
Carolyn Keene
The Best American Mystery Stories 2013
Tamasin Day-Lewis
Theodore Tinsley
Cecil Day-Lewis
The Best American Mystery Stories 2009
Arthur Leo Zagat
Joan Hess

The Best American Mystery Stories is a yearly anthology of mystery stories published in United States magazines and anthologies.
 It was started in 1997 as part of The Best American Series published by Houghton Mifflin.
 Stories are chosen using the same procedure with other titles in the Best American series; the series editor (Otto Penzler in this case) chooses about fifty article candidates, from which the guest editor picks 20 or so for publication; the remaining runner-up articles listed in the appendix.
Miranda Rose Shearer (born 11 May 1982) is a British journalist and author.
 She is the daughter of John Shearer, a former Oxford University graduate and BBC employee who worked for many years as Head of Broadcasting for the North before transferring to the South, and Tamasin Day-Lewis, documentary maker, former Telegraph columnist and author of a number of cookbooks.
 Miranda is also the granddaughter of Poet Laureate C. Day-Lewis and actress Jill Balcon and the eldest niece of three-time Oscar-winning actor Daniel Day-Lewis.
 She is a resident of Somerset.
Carolyn Keene is the pseudonym of the authors of the Nancy Drew mystery stories and The Dana Girls mystery stories, both produced by the Stratemeyer Syndicate.
 In addition, the Keene pen name is credited with the Nancy Drew spin-off, "River Heights and the Nancy Drew Notebooks.
The Best American Mystery Stories 2013, a volume in "The Best American Mystery Stories series", was edited by guest editor Lisa Scottoline with Otto Penzler.
 The series editor chooses about fifty article candidates, from which the guest editor picks 20 or so for publication; the remaining runner-up articles listed in the appendix.
Lydia Tamasin Day-Lewis (born 17 September 1953) is an English television chef and food critic.
 Day-Lewis is the daughter of the poet Cecil Day-Lewis and actress Jill Balcon and the sister of the actor Daniel Day-Lewis.
Theodore A. Tinsley (October 27, 1894 – March 3, 1979) was an American author who primarily wrote mystery stories.
 Tinsley wrote 27 stories featuring The Shadow for "The Shadow Magazine" pulp magazine.
 He also created Carrie Cashin, one of the first female detectives in pulp fiction, who appeared in Street & Smith's "Crimebuster" pulp magazine.
 An early series he wrote is the "Amusement Inc./Scarlet Ace" series that ran over 4 different pulp magazines in the 1930s.
Cecil Day-Lewis (or Day Lewis) (27 April 1904 – 22 May 1972), often writing as C. Day-Lewis, was an Anglo-Irish poet and the Poet Laureate of the United Kingdom from 1968 until his death in 1972.
 He also wrote mystery stories under the pseudonym of Nicholas Blake.
 He was the father of actor Daniel Day-Lewis and documentary filmmaker and television chef Tamasin Day-Lewis.
The Best American Mystery Stories 2009, a volume in "The Best American Mystery Stories" series, was edited by Otto Penzler and by guest editor Jeffery Deaver.
Arthur Leo Zagat (1896–1949) was an American lawyer and writer of pulp fiction and science fiction.
 Trained in the law, he gave it up to write professionally.
 Zagat is noted for his collaborations with fellow lawyer Nat Schachner.
 During the last two decades of his life, Zagat wrote short stories prolifically.
 About 500 pieces appeared in a variety of pulp magazines, including "Thrilling Wonder Stories", "Argosy", "Dime Mystery Magazine", "Horror Stories", "Operator No. 5" and "Astounding".
 Zagat also wrote the "Doc Turner" stories that regularly appeared in "The Spider" pulp magazine throughout the 1930s, and wrote for "Spicy Mystery Stories" as "Morgan LaFay".
 A novel, "Seven Out of Time", was published by Fantasy Press in 1949, the year he died.
Joan Hess (born 1949) is an American mystery writer, a member of Sisters in Crime, and a former president of the American Crime Writers League.
 She wrote two popular mystery series: "The Claire Malloy Mysteries" and "The Maggody Mysteries" (also called "The Arly Hanks Mysteries"), and has contributed to multiple anthologies and book series, including: Crosswinds, Deadly Allies, Malice Domestic, Sisters in Crime, and The Year's 25 Finest Crime and Mystery Stories.
 She also writes the Theo Bloomer mystery series, under the pseudonym Joan Hadley.