PC Cass Rickman calls in sick after over-indulging at a barbecque for the relief the previous night. PC Harker and PC Stamp are called to the Sun Hill Lido swimming pool, where a young girl's body has been found in the water. Harker goes undercover at the pool, where he runs into the miraculously-recovered Rickman. The pair team up to catch a peeping-tom with a digital camera, but Rickman's warrant card is stolen when her locker is broken into. Eventually they discover that the pool's Australian lifeguard Steve Kellerman is dealing drugs and that the dead girl died in an accident when she joined he and his friends for a late night pool party.