Investigating the unsolved 2015 murder of John Palmer, who was nicknamed Goldfinger after his involvement in melting down gold from the 1983 Brink's-Mat robbery. Palmer was found dead in his Essex garden and while police originally believed he died of natural causes, they eventually confirmed the case was being treated as a professional hit.

A professional hitman is suspected in John Palmer's murder, with evidence pointing to a cartel and an Eastern European enforcer.