Mt. Thomas station is full of secrets. Maggie and PJ have come back from holidays deeply in love but determined that no one, especially Tom, will find out about their new relationship. Meanwhile, Nick and Adam have intercepted Dash's Confirmation Certificate as a fully-fledged constable in order to have it framed for a special presentation, and Tom and Chris are conspiring to organise a surprise celebration for Dash's 20th birthday. Into this web of intrigue comes a very distressed Elly Winslow, asking for police protection because her ex-husband, Danny Hobson, has just been released from prison in Queensland where he was serving time for sexually molesting his own son, and she is terrified that he will come looking for them.

Dash is somewhere out there in a bus with a group of school children, their teacher and an armed gunman, and the Heelers are feeling especially bad about it because they led Dash to believe that they've forgotten her birthday. When the bus is found abandoned, the Heelers must decipher both true and false clues in order to find the missing children.