A traumatic spelunking experience leaves Lorna McHaley haunted by disquieting nightmares regarding the deaths of people close to her. They disrupt every aspect of her life, especially her relationship with her best friend, Paige. One by one Lorna’s nightmares come true; each victim is killed by a terrible monster she claims attacked her in the cave. Lorna struggles between her own possible madness and the belief that the creature truly exists. With Lorna on the verge of a breakdown, Paige must uncover the secret of the mysterious cryptid. When she does, it will mean betraying Lorna and sending her into ruin.