Sam agrees to investigate on the disappearance of two Australian girls from a freighter at the Singapore harbour. The investigation leads him into Singapore's criminal underworld and Sam gets involved in a dangerous game that could cost the girls their lives. Meanwhile, Patricia is confronted by a painful truth of Winston's past. Miller forces Conrad into going double, while Sam and Claire's relationship gets pushed to a breaking point.

When Sam goes out on a limb for an ex-World War II Australian soldier who had been accused of murder, no one understands why he is so adamant on the man's innocence - least of all Macca, who had been in love with the girl who was murdered. Either gaol the accused man for life or Sam has just made a very big mistake about his hero and friend.

Sam is on the brink of discovering the truth behind the murder of Patricia's husband - a murder that involves a secret deal between James Lim, Kay Song and the CIA. But is he obsessed with solving this case in order to avoid facing the fact that he might lose Claire forever?