Ominous final emails sent by Gareth Train never made it into the hands of Queensland police. 

Why were those four young constables sent to that property, into that ambush, without all the information? Would it have even made a difference?

This episode takes us back to the start, unravelling the missing persons report that set this whole series of tragic events in motion. 

More than a dozen New South Wales and Queensland police officers are called into the witness box; every conversation, phone call and email scrutinised.