“Psychopath” by Keith Ablow is one of those books that kept me up all night. I could not turn out the lights until I turned the last page. This chilling psychological thriller is the third of the Frank Clevenger novels.   Dr. Frank Clevenger is a forensic psychiatrist who has battled drug abuse and alcoholism. His notoriety has risen due to a previous case. He solved a high profile murder case and then adopted the man’s traumatized son. Now his expertise is very much in demand. The FBI asks him to help in the Highway Killer case. Frank is interested but turns them down. He has problems at home. His seventeen year old adopted son, Billy, is getting into fights at school and dealing drugs. Frank is afraid he may lose custody. But when the serial killer contacts him via a letter in the newspaper he’s drawn into the case. The killer is actually Jonah Wrens, a brilliant psychiatrist, who treats badly disturbed children. Wrens moves from job to job and has left a tr ...