Nick is awoke in the middle of the night by a drunken tour operator who reports that one of his clients has gone missing in the National Park. The Heelers question the woman's husband and their pregnant friend, but they say the woman fell behind during an evening bushwalk and just... disappeared. While the Heelers are conducting a thorough search of the park in daylight, PJ wants a word with Aussie Andy, the tour operator, believing that his drunken carelessness may have contributed to the woman's disappearance. But when PJ and Ben are climbing up the rocky bluff where Andy is supposedly searching, PJ falls and twists his ankle badly. Unfortunately their only radio was smashed in the fall, and PJ finds himself extremely grateful for Ben's help - especially as he has insisted that they carry on. Up on the bluff, Ben finds a lost gold earring.