Eight volunteers find themselves fighting for their lives when a drug trial goes horribly wrong.

As the result of an armed robbery Mickey Ronson has served eight years in prison, leaving his wife Gemma and their child Lucy to cope on their own. As the time of Mickey's release draws near he can't wait to get back to his family and continue on with their lives. He plans a surprise for his loved ones by keeping the date a secret from all but his sister. Not long before he gets out, Mickey's brother Bobby gets involved with Gemma and Lucy on the pretence of helping them out. But Bobby has his own agenda and the events that ensue change all of their lives forever.

In a juvenile detention center, the inmate Dave commits suicide after being abused with his friend Lindsay by the sociopath bullies Steve and Lewis under the indifference of the other cell-mates. The governor sends them to an uninhabited island to improve their relationships and characters under the command of the tough monitor Jed. They meet another camping with female delinquents under the command of veteran soldier Louise and they camp in another area. However, when they are attacked by a pack of dogs and a mysterious man with a cross-bow wearing camouflage, they join forces fighting to survive under the leadership of Callum.

A woman is forced into a deadly game in which she has to kill five people or all her friends and family will be butchered.