A young woman's mysterious death during an idyllic Caribbean vacation creates a traumatic ripple effect that eventually pulls her surviving sister into a dangerous pursuit of the truth.

No sooner has 15-year-old Lee Keegan been expelled from his private school than an apocalyptic event wipes out most of the world's population. With his father dead and mother trapped abroad, Lee is given one instruction: go back to school. But safety and security at St. Mark's School for Boys is in short supply. Its high walls can't stop the local parish council from forming a militia and imposing marshal law, while inside the dorms the end of the world is having a dangerous effect on his best friend and his unrequited crush on the school nurse isn't helping him concentrate on staying alive.

Femi is a British boy of Nigerian heritage who, after being fostered in rural Lincolnshire, moves to inner-city London to live with his birth mother. Struggling with the unfamiliar culture and values of his new environment, teenage Femi has to figure out which path to adulthood he wants to take.