A thousand lives. A thousand possibilities. One fate. Marguerite Caine grew up surrounded by cutting-edge scientific theories, thanks to her brilliant physicist parents. Yet nothing is more astounding than her mother's latest invention, a device called the Firebird that allows people to leap into alternate dimensions. When Marguerite's father is murdered, all the evidence points to one person?Paul, her parents' enigmatic star student. Before the law can touch him, Paul slips into another dimension, having committed what seems like the perfect crime. But he didn't count on Marguerite. With the help of another physics student, Theo, Marguerite chases Paul through various dimensions. In each new world Marguerite leaps into, she meets another version of Paul that has her doubting his guilt and questioning her heart. Soon, she is swept into an epic love affair as dangerous as it is irresistible.