It's 1969, and things have taken a darker turn for the old Cowley team. With the gang now scattered across Oxfordshire, it takes a series of brutal crimes to reunite them. Now joined by former adversary DCI Ronnie Box and his sidekick DS Alan Jago, the gang must battle crime and corruption to finally solve their greatest challenge, which is to find the truth behind George Fancy's death.

After three lighthouse keepers arrive for work on a remote Scottish isle, they make a fateful discovery: a wrecked rowboat, with a chest full of gold. As a mysterious boat heads toward the island, the three men make a choice that will change their lives forever, ensnaring them in a web of greed, paranoia, and murder.