Read "The Corner House" by Fred M. White online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
Sergeant Paul Prout was beginning to come to the conclusion that the Corner House mystery would have to be relegated to the long list of crimes concerning which Scotland Yard is fain to be silent. At any rate, the matter was utterly beyond him. Given a clue to work on, no man in the force could display more tenacity and skill. But there was nothing to go upon and Prout was utterly devoid of imagination.
Of course there was always the chance of coming on the track obliquely.