Maggie and PJ are still trapped together underground, unbeknownst to the other Heelers, who are busy trying to locate Matt Kinsella, now suspected of attempting t murder his mining partner, Jamie Burgess. They discover both the men are ex-security guards from WA, who were involved in a gold bullion heist more than seven years ago during which a colleague was killed. It's only when PJ's car is discovered abandoned and carefully wiped clean of fingerprints that Tom realises something is seriously wrong. A search finally leads to the collapsed mine and mere chance and a Mintie wrapper leads to the discovery of Maggie and PJ's living tomb. The rescue is complicated when the removal of rubble causes the mine to collapse some more, but eventually PJ and Maggie are rescued—only to insist on tracking down Burgess and Kinsella who left them to die. But Burgess is in hospital with head wounds and Kinsella has disappeared. The key seems to lie with Burgess's girlfriend, Deanna, who turns out to be the widow of the third security guard who died in the bullion heist. How is she connected, who tried to smother Burgess in his hospital bed, and where is the elusive Matt Kinsella? Having found the answers to all these questions, Maggie and PJ have a decision to make about their mutual future.