Aboard the mega cruise ship Sacramentum, 20-year-old new recruit, Jamie, 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.
A veteran beat cop and teenage girl fall to their deaths from a tower block in south-east London, leaving a five-year-old boy and rookie police officer Lizzie Griffiths on the roof, only for them to go missing. Detective Sergeant Sarah Collins is drafted in to investigate, working to find Lizzie before she comes to serious harm, but also to uncover the truth behind the grisly tower block deaths.
