It has been two years since a stolen Mercedes Sedan intentionally drove into a large crowd of people, killing 16 and injuring dozens more. Bill Hodges, the now retired police inspector who was in charge of the investigation, could never let go of the case or the killer who was never caught. Hodges begins to receive mysterious unsettling messages containing information never released to the public and decides to start his own unofficial investigation.
Hodges and Janey dig deeper into the circumstances surrounding Olivia's death. Hodges uses Debbie's Blue Umbrella to turns the tables on Brady. Jerome's father intervenes in his relationship with Hodges.
Hodges struggles with the past as it concerns his daughter, Allie. As Deb attempts to make a change for the better, Brady interferes. Robi continues pressuring Brady to impress their bosses. Hodges connects with Janey's cousin, Holly.
As Hodges helps Janey through a difficult time, their connection deepens. Realizing he still needs their help, Hodges brings Jerome and Holly back into the investigation. Deborah confronts Brady with her concerns.
Jerome and Holly tell Hodges their concerns about the Mercedes Killer. Tensions continue to escalate between Brady and Robi. As details about the investigation emerge, Hodges, Pete, and Izzy close in on their suspect.
With Brady hospitalized, Hodges and Holly rebuild, opening the private investigative agency Finders Keepers; Brady's care falls to Dr. Babineau, an ambitious neurosurgeon, with input from his brilliant wife, Cora.
Hodges struggles with his cases at Finders Keepers, putting him at odds with a concerned Holly; Sadie senses a shift in Brady's medical state and informs Dr. Babineau; Jerome arrives home from Harvard for the summer.
Hodges is rattled by the unexpected death of a hospital staff member. Jerome offers much needed help in Hodges's quest to uncover the truth. Brady works to master the limitations of his newfound ability. Already struggling to cope, Lou suffers additional setbacks.
Eager to prosecute Brady, Montez turns up the heat on Dr. Babineau. Holly feels betrayed when Hodges' meddling threatens the future of Finders Keepers. When violence hits close to home, Montez seeks help from Hodges.
A visit from Lou elicits an unprecedented response from Brady, and Dr. Babineau pushes him to communicate. Holly begins to come around to Hodges' thinking about Brady. Armed with new intel, Hodges reaches out to Babineau and Cora.
Hodges and Donna look toward a new future. Jerome contemplates his place in the world. Under pressure from Cora and Vitalta, Babineau performs brain surgery on Brady. Montez and Hodges effort to get Brady transferred out of Mercy General.
After Hodges suffers an attack, Ida, Holly, and Jerome rally around him, but Donna is reminded of her deepest fears. As support of Babineau's treatment methods dwindle, Babineau goes over Montez's head.