Criss Cross

Only hours after witnessing the execution of a killer he helped put behind bars, Alex Cross is called to the scene of a copycat murder. A note signed 'M' rests on the corpse: 'You messed up big time, Dr. Cross.' Was an innocent man just put to death? As the executed convict's family launch a vicious campaign against Cross, his abilities as a detective are called into question. The enigmatic 'M' lures Cross out of Washington, DC to the sites of multiple homicides, all marked with distressingly familiar details that conjure up decades-old cases and Cross family secrets. 

Book 27 in the Alex Cross series.