Festivities take a back seat as DI Parker investigates the murder of a podcaster. She had been probing the disappearance of a child and claimed to have found new evidence. The missing child has haunted Commissioner Patterson for years.
Follows Abby, a child who befriends a magnificent wild blue groper while diving. When Abby realizes that the fish is under threat, she takes inspiration from her activist Mum, Dora, and takes on poachers to save her friend.
Nobody in the precinct likes the new captain, Wunsch continues to humiliate Holt as he takes his new job in Public Relations, and Jake and Amy try to figure out what to do next after their kiss.