Teacher Alistair Veale is just coasting along in his 20 year marriage to Ann. His two sons Tom and Jake are growing up fast and have their own interests, but he still enjoys a close relationship with 13-year-old daughter Jessie, his 'Princess'. When Alistair takes 14 children from his tutor group on a week-long school trip to the Isle of Wight, a new Science teacher, Carly Jessop, goes along to keep an eye on the 6 girls. Alistair notices a growing attraction between himself and Carly, which cannot be ignored. However, when Alistair and Carly begin an affair the consequences are horrific and far-reaching, threatening not only Alistair's livelihood, but also his peace of mind and the relationship he has with his own three children.