Long-buried memories are raked up for JP when someone from his past is caught red-handed at a murder scene and Jack must unravel a complex mystery to find the truth.

When Billy Springer, lead guitarist of a popular reggae band, is murdered, DI Mooney and his team must crack a cold case that has haunted the Commissioner for years, before they can arrest the killer. After performing on stage as part of Leon And The Ragers 30-year reunion gig, Billy is found dead moments later in his dressing room.