Sound Proof

Chicago private detective Frank Dragovic is working downstate, going undercover at Midwest Music Madness, a festival targeted by a thief.

The corn is high in Iroquois County, the food deliciously Midwestern, the music old-time tunes and songs. But sour notes abound, and theft of musical instruments soon crescendos to blackmail and then- murder.

Are the thief, the blackmailer, and the murderer the same person? Two different people? Three? Sound Proof is a surprising revenge-plot mystery with a...