DEATH ARRIVES ON THE MORNING TIDE. The ageing cargo liner Alexandra Rose steams into the Mersey Estuary, enveloped in thick fog that delays her entry into the port of Liverpool. When one of the ship's passengers is found dead in his cabin, a chain of events is set in motion that leads to one of Detective Inspector Andy Ross's most baffling and complicated cases to date. The first death is soon followed by another, and Ross discovers that his case has its roots in the depths of the Amazonian Rainforest in Brazil. A billionaire entrepreneur, passengers who may not be exactly who or what they say they are, a team of medical researchers and a team of vicious mercenaries combine to confound and complicate what begins as a simple death aboard a nondescript and insignificant ship. Ross and his team from the Merseyside Police Specialist Murder Investigation team need all their skills in order to solve the case of the 'Mersey Mariner.'.