Whitney and Tommy Leighton are more than they appear to be. The twins were born in our dimension, but it wasn't just a birth. It was a rebirth. They originated in a another dimension that runs along the same parallel as ours. In the other world, Whitney is a Baran-Dok-Toi Prim warrior, and Tommy is a Prectock, but they know nothing about that. Other than the strange dreams that Tommy is beginning to have.
Based on the world, setting, and characters in Philip K Dick’s Second Variety. After Sam Walker's space shuttle was destroyed by a mysterious rocket, he thought he'd gotten lucky when another ship came along to rescue him. But when he finds out his rescuers also have his cargo and are holding him and a few others prisoner, he becomes suspicious about what Celmos Corp has him transporting to Mars.