On a freezing October morning, Detective Inspector Frank Keane is called to the scene of a crime on Liverpool's shoreline. The body of what looks like a man, brutally tortured and burned, has been tied to a pole on the beach. With very little evidence to go on, Keane and his partner, DS Emily Harris, rely on their gut feeling that this murder is gang-related and their investigation takes them, once again, into the murky underworld of organised crime. Over in Australia, ex-Liverpool Police detective Menno Koopman - Frank's former boss - is enjoying his retirement. He has no plans to ever return to England but when the body on the beach turns out to be his son, Stevie - whom he only ever met once as a baby - he knows he has to go back and seek justice for his horrific murder. But there's a fine line between justice and revenge...