Monk, a brilliant detective with obsessive-compulsive disorder, returns to solve one last case involving his stepdaughter Molly who's a journalist preparing for her wedding.

Depressed by COVID and the loss of his advance after he's unable to finish his memoirs, Monk prepares to reunite with his dead wife Trudy. But he has to first solve the murder of his future son-in-law at the hands of a ruthless billionaire who has masterminded the perfect murder. But no murder is perfect when Monk is on the case.—Gislef