The Riddle of the Roost
The Riddle of the Roost is a 1939 mystery detective novel by the Irish-born writer Lynn Brock. It was the third and last in his trilogy featuring the characters of Scotland Yard detective Sergeant Venn and Constable Kither. It was Brock's penultimate novel, followed the next year by The Stoat a final entry into the series of his best-known character Colonel Gore. Synopsis
In the picturesque settlement of Pinehill the peace and quiet is disturbed by the double murders of Winfred Dorbin and his twin brother Hector, at their country house. The local police and inhabitants suspect a simple-minded villager of the murder. Only the arrival of Sergeant Venn towards the end of the story brings some clarity. References

Bibliography
 Hubin, Allen J. Crime Fiction, 1749-1980: A Comprehensive Bibliography. Garland Publishing, 1984. Reilly, John M. Twentieth Century Crime & Mystery Writers. Springer, 2015. 1939 British novels
British mystery novels
Novels by Lynn Brock
Novels set in England
British detective novels
Collins Crime Club books