Sam Gerard is a well-known mobster who is about to be exposed. His estranged son, Craig Gentry, is arrested for murder, but refuses to go to Sam for help, and instead, goes to Ben Matlock.

Craig continues to turn away from his father as Matlock keeps trying to investigate the case. When the Gentry family is almost caught in the middle of a mob war with the Hernandez family, Matlock realises that someone on the inside is pulling the strings.

Matlock agrees to defend psychiatrist Lucas Forbes when he's arrested for killing Adam Whitley, the husband of one of his patients whom Lucas was reportedly having an affair with, according to the woman's diary. Matlock soon realises that Erin Whitley has a host of deep-rooted psychiatric problems. After a few chance meetings with a woman named Shannon, Matlock is shocked to realise the extent of the connection between Erin and Shannon.