The rookies are temporarily paired with new training officers, and Officer Nolan is paired with Officer Lopez. When Nolan and Lopez track down an escaped criminal, they discover a little kindness goes a long way. Meanwhile, Jackson is forced to face his fears when he is partnered with Officer Bradford, while Officer Chen and Nolan must face a hard truth.
Nora lets something slip about the future that devastates Iris. In an attempt to distract his wife, Barry asks Iris to team up to stop a new meta, Rag Doll. Meanwhile, Caitlin learns something about her father.
Murtaugh turns to Cole's former mentor, Tom Barnes, for help on a high-stakes cartel case. Meanwhile, Murtaugh and Trish meet Natalie and Maya for the first time, and tensions mount between Bailey and "The Gute", as the new partners begin to work together.
After a mural by a street artist and activist is stolen, the NCIS investigation leads to a conspiracy regarding a Navy contractor and the safety of ocean mammals. Also, Bishop shares a special connection with the street artist.