Hard working, passionate and talented, Greg Irving is on the verge of becoming a best-selling author. When his agent requires him to step in as a last-minute replacement for a fellow writer at a lucrative book convention in Sheffield, Greg reluctantly accepts. With only hours to get there, he boards a red-eye coach for the 89-mile trip. With nine hours ahead of him, solitude and silence his only companions, he settles in for the overnight journey.
However, the journey doesn’t go according to plan. After a few miles, a woman boards the bus and, despite the coach being empty, takes the seat next to Greg. The woman is a self-proclaimed fan, a bookworm, someone who has followed his work since the early days. Initially flattered by the attention, Greg soon becomes aware of the woman's alternative agenda, one that slowly twists casual conversation into something a lot more sinister…