During a long hot summer in the 1970s, four boys roam free through a neglected rural paradise, until a tragedy strikes that sets them against the adult world and changes their lives forever.

A socially awkward, environmentally conscious teenager named AJ is dragged to a coastal holiday park by her painfully 'normal' family, where she becomes unexpectedly captivated by a chlorine smelling, sun-loving lifeguard named Isla.

After the alleged suicide of her priest brother, Grace travels to the remote Scottish convent where he fell to his death. Distrusting the Church's account, she uncovers murder, sacrilege and a disturbing truth about herself.