1994. In the once glorious, now ragged, city of Gloucester, two kids stand on a street corner watching the police remove multiple human remains from a house.

Adam, a Jehovah's Witness, thinks it's a sign that Armageddon is imminent. Holly, his sociopathic best friend (a one-sided arrangement), thinks it might suggest her mum didn't just pop out for cigarettes after all.

As one of the largest serial killer investigations in UK history plays out, Adam and Holly become caught up in currents they don't fully understand, with terrible consequences.

Now, 12 years later, Holly is back; Adam never left. Holly is still determined to uncover the truth, by any means necessary, while Adam is trying to cling onto the remnants of his faith - in Jehovah, and in other people.

An uneasy love story unfolds between them, although Adam has lost all hope of salvation, Holly may not be capable of love, and the dark forest they've entered has no easy way out.