When ex-cop Spenser returns to Boston after a stint in prison, he finds himself embroiled in a mystery involving the murder of a fellow officer. With the help of his feisty roommate and an aspiring MMA fighter, he uncovers a conspiracy that runs deeper than he ever imagined. Combining action, humor, and a touch of romance, the film showcases Spenser's journey to bring justice to those responsible while also facing his own demons.