The book I read was a reprint but the book first appeared in the 1920's and clearly after WW1 when various people had been in the war. The mystery begins with a college professor settling in to read a library book when he finds a strange photo tucked into it. The photo shows a man pointing a gun at another sitting in a chair. The events that follow this find tweaks his interest and soon he is pulled into the puzzle of what is this photo about?
This photo begins the Mr. Flint's foray into solving a murder and clearing suspicion on a man acquitted of the crime-- though everyone believes he did it. Methodical but very entertaining. The dialogue is fun and the characters are lively. Each corner of information is inspected and finally Mr. Flint is able to break the alibi of his favored suspect. While the beginning is someone lacking in vigorous activity the end contains danger of Mr. Flint's life!
If you are a fan of older crimes this one is fun, and the dialogue far from stuffy makes me smile. It also shows just how each detail that one finds can hold the key to a solution or can lead you danger, or a bluff.
This is the first book I've read of the Cole Team and it's one of the earlier ones, it's success led to a series of books.