Christian King (Emun Elliott) is a a world-renowned space scientist who claims to have received images from space of a disastrous explosion that has yet to happen. A sceptical police team led by D.I. Rebecca Flint (Tamzin Outhwaite) and D.S. Ben Holt (Mark Bonnar) is assigned to investigate. With only 18 hours left to overcome their disbelief and avert potential disaster, the team finds itself caught up in a frantic race against time to discover the truth.