After engaging in bloody warfare against each other, two alien races—the Greens and the Grays—take refuge on Earth, both believing their home and their enemy destroyed. For seventy-five years, they have been passing as humans, living peacefully—until each side discovers the other has survived. Now, in order to avoid another destructive conflict, these extraterrestrial rivals have united and agreed that a sacrifice must be made . . .

On a dark and cold October night in Manhattan's Riverside Park, a strange ceremony is about to begin. The group is focused on a young girl who is ready to do what she must for peace, but the ritual comes to an abrupt halt when the child is mysteriously kidnapped.

Meanwhile, after four years of marriage, Roger and Caroline Whittier struggle to get through a day without fighting. Their bickering is interrupted when a bizarre mugger leaves them with a little girl named Melantha. While they disagree on most matters, they both know they must protect Melantha. Unfortunately, they have no idea who is looking for their foundling or the lengths they will go to get her back. Now, the chase is on . . .