7 to 12 

by Anna Katharine Green is a detective novel presented as one of her earlier tales.  It is a quick, fast-paced mystery sure to have the reader turning pages.

6 Seconds of Darkness by Octavius Roy Cohen

Energetic sleuth David Carroll, whose probe into police corruption has made him unpopular at headquarters, is put in charge of an investigation into the shooting murder of civic reformer Edward Hamilton -- and the three people trying to confess to the crime! It develops into an unusual and interesting plot.