Anthem Fleet, talented ballerina and heir to the Fleet fortune, is closely guarded by her parents in their penthouse apartment. But when she goes to a dangerous party in the wrong part of town, she meets the handsome Gavin and is immediately drawn into his forbidden world. Then, in a tragic accident, Anthem falls to her death. She awakes in an underground lab, with a bionic heart ticking in her chest. As she negotiates her dangerous new life, she uncovers the sinister truth behind those she trusted the most.