Doctors - Rob Hollins's past will be explored on screen when he is called in to work to help with an important case.

Rob is on annual leave when he is asked to interview Andy Weston, a man connected to an investigation into a sinister group known only as Treehouse.

Weston insists that he will only speak to Rob, so Superintendent Desmond Noakes reluctantly brings him in to deal with the situation.

Rob is briefed by Noakes

It turns out that Rob and Weston went to school together, but the interview doesn't go particularly well as Weston is stubbornly uncooperative when they come face-to-face again.

Weston does warn Rob that there are other police officers at the station who can't be trusted, but drawing out any further information about this or Treehouse proves impossible.

Flashbacks also reveal that Rob threw a full beer can over a bridge and caused a fatal accident when he was much younger, which Weston took the fall for. Rob owes him everything, but can he put this aside to deal with the case at hand?

Flashbacks reveal Weston and Rob's past

Rob gets emotional over his past

Airs  Friday, August 21st