Murder by the Clock by Rufus King — Read

Lieutenant Valcour's eyes narrowed slightly. He had a habit of dividing suicides into two classes -- those who talked about killing themselves, and those who did so. He knew that the two rarely overlapped. He felt a shocking conviction that in Mrs. Endicott's case she might well have been the exception which proved the rule. "I suppose an attic is the conventional place for suicide," he said. "Or at least to think about it."

Mrs. Endicott's laugh was without humour. "One doesn't need an attic in order to think about it."