TRIPLE DOG takes place in a small suburban town, where six high school girls play a game of dare that staggers out of control, altering their lives forever… the popular girl, Eve (Alexia Fast), is having her 16th birthday slumber party, when her best friend, the attention-hungry Chapin (Brittany Robertson), arrives late and the party starts spinning out of control.

Content to entertain themselves with facials and pedicures, tomboy Chapin suggests they play a game of dare called, "Triple Dog". The rules are simple: everyone gets a dare and gives a dare. Failure to perform a dare results in one's head being shaved. Whoever performs the best "Triple Dog Dare" by the end of the night wins a cash prize, their friends' prized possessions and the ultimate respect from their peers.

As the night goes on, Chapin challenges each girl to take greater and greater risks. However, it becomes apparent that Chapin is holding on to a big secret. She was there the night her former classmate, Stacy St. Clair, jumped off a bridge and killed herself. No one knows what happened for sure, but everyone has a strong opinion.

Chapin is aware that some of her friends hold her responsible for her friend's apparent suicide, and she is defensive about the subject that it's easy to see why. Maddened by the rumors that continue to swirl around her, she runs for the bridge that Stacy St. Clair jumped to her death from, and before her friends can catch up to her, she jumps off too. And it is at the moment that Chapin puts her own life in danger that we finally discover the truth behind the secret that has haunted her.