Too Clever By Half — Laurence Meynell

When Lady Darley asks for Hooky Hefferman's help, he wonders what sort of trouble she can be in. She doesn't look the sort to have a very grisly skeleton in her cupboard, but you never can tell ... Hooky's insatiable curiosity is soon aroused by her story, and he is easily persuaded to go down to Monkhamblin Hall, the old family mansion. Once there, a corpse and the odd behaviour of the present owner are quite enough to keep his famous nose glued to the trail.