A British politician, 19 years old daughter, was found dead in Sydney Harbour, opening a complex murder investigation across national borders.When a British police detective and an Australian colleague were forced to join forces to pursue the murderer, the two cultures were intertwined in the collision, and contradictions and differences emerged.However, this cross-border investigation reveals far more than one murder case - as two detectives gradually unravel, a huge conspiracy involving political power has quietly surfaced, and their relationship will face unprecedented tests in this pursuit of truth.