The Conspiracy Club, written by Jonathan Kellerman, is a gripping psychological conspiracy mystery novel. It follows the story of psychologist Jeremy Carrier, who becomes entangled in a web of murder and conspiracy after a former patient's death. As Jeremy investigates, he uncovers a secret society known as The Conspiracy Club, whose members are willing to kill to protect their secrets. The Conspiracy Club is a suspenseful and thought-provoking book that explores the dark side of human nature.