Good Morning Lemmings (S07E05)

Graffiti starts popping up across London from an anonymous source who claims to have killed a well-known street artist, prompting the team to revisit the case from four years ago. The victim had transitioned from gang life to pursuing solo work with the backing of a rich art patron, raising suspicions about his bitter ex-gang members. At the same time, Brian joins Twitter to document the tough realities of being a police officer, much to the annoyance of his colleagues.