In this episode, it's the height of the Australian summer and as the heat takes its toll on some our ex-Gardaí, others relish the opportunity to celebrate Christmas on the beach. In Kununurra, 3,000 kilometres north of Perth, Michael Henderson takes a long trip into the outback in search of a missing person. Dubliner Joe Connolly heads to the beach with his new friends to celebrate Christmas. Forensics officer Peter Crosbie suffers through crippling heat as he investigates a burglary. Homesick Martin Mitchell and girlfriend Niamh visit the Irish store. And Detective Ciaran Cleary takes to the air in search of a runaway car-jacker.