John Dickson Carr 
Scandal at High Chimneys [EPUB ebook] 

Matthew Damon was a loving father and a figure of moral rectitude. Why, then, has a rumour of scandal followed him, denying him the knighthood he thought he had earned? Why had he, long ago, repeatedly and alone visited the cells of condemned young women?Behind the discreetly drawn curtains at High Chimneys something sinister lurked. Black-haired Kate and demure Celia were suspect. Brother Victor was distraught. The second Mrs Damon was indiscreet. And murder was done. It takes the brilliance of Jonathan Whicher (he of the The Suspicions of Mr Whicher), to untangle this mysterious puzzle.’Faultless puzzle in detection’ New York Times Book Review