The team is asked by Dawn Abbott to reopen a fourteen year old case of a fire at the Union drinking club, which killed gangster Mark Johnson and three staff members. It was thought to be an accident but Mark told Dawn days before the fire that he thought somebody was out to kill him. Mark's brother Danny resents any suggestion that he was involved but fire investigator George Mackie tells the team that he thought at the time that the blaze was suspicious and the widow of the painter whose materials were supposedly to blame for the fire recalls that he was handsomely paid soon afterwards. Ultimately the culprit proves not to be a person with a grudge but a serial arsonist hoping to get away with as many fires as possible.