Dani Oxley, a passionate art teacher, stands by a school bus checking off students' names as they board. She greets fellow teacher Jimmy, and his boisterous son Matt. Dani has a stilted goodbye with her detached husband Tim. She goes to the art room to find Sienna, a troubled but talented student, drawing. Dani, Sienna and lastly Zac board the bus and they travel to the Mallory Adventure Centre.
Tensions rise between Matt and Zac, which unsettles Dani, but she's preoccupied. A spark between her and Jimmy on the first night leads to a passionate kiss. The next morning as she readies the students for team building exercises, she tries to ignore Jimmy's advances. But in a moment of weakness, she leaves her students unattended and meets Jimmy in the boathouse where they have sex.
Upon her return she finds the students scattered around. She does a head count but is missing one student - Zac. Panic sets in as Dani, Jimmy and another teacher, Bel, search for Zac. Shock and fear permeate the group as DI Calgetti records their statements and Dani is forced to lie about where she was. Sienna is distraught, while Matt challenges Dani's whereabouts during the exercise.
