The team investigates the suspicious deaths of two partners, while also uncovering a grim scene involving a couple in a residential unit. Sing-pak travels to Japan for leads at a university.

Pui-ching investigates the deaths of a couple and uncovers missing cash and a valuable watch. Sing-pak's team finds evidence that suggests the deaths were not suicides.

Sing-pak visits Japan to investigate a former tennis teammate of Po-ying but only finds the teammate's husband, who reveals unexpected information. Meanwhile, Ho-yin and the team question a suspect who stole a valuable watch.

The team reveals the truth about Tam Fat's death to his daughter. Ho-yin investigates a hit-and-run case, and Pui-ching uncovers suspicious details about her mentor's death.