Crooked House

Then the wealthy patriarch of the household, Aristide, is murdered - injected not with insulin for his diabetes but with a killer substance. Suspicion falls on the whole household, including Aristide's two sons, his widow - fifty years his junior - and even his three grandchildren. Could any member of this seemingly devoted family have had a hand in his death? Can Charles Hayward, fiance of the late millionaire's granddaughter, help the police find the killer?