Set aboard The Sacramentum cruise ship, follows 20-year-old new recruit, Jamie, as he infiltrates the 3000-strong crew in a desperate race to find his missing sister. She was working aboard the same vessel on a previous tour and vanished mid-charter. Jamie is initiated into cruise life and gets a crash course on the tribes within the staff: the theatre kids, the mafias and the low-paid workers. For this overworked and underpaid crew, life below deck can be an odyssey of partying and excess… and they remain oblivious to the bloodthirsty murders taking place on board. Jamie is forced to turn detective and uncover the sinister truth.