Nemesis

DS Lucas Walker is on assignment for the AFP, and it couldn't be more personal. This is his last chance to take down Stefan Markovich - the Vandals leader who tried to have him killed after Walker uncovered his drug operation, and who has evaded justice for years.

Having tracked Markovich to Berlin, Walker heads to Germany to lure his nemesis out of hiding and into custody. And there is another draw for Walker in Berlin: he finally gets to see Barbara again.

Still dealing with the trauma of her sister's ordeal in outback Australia, Barbara is working her own case - a suspicious death that casts a dark shadow over a peaceful lake colony.

As Walker and Barbara grapple with their cases, they must also face their feelings for each other amid the constant threats of the world they inhabit.