They should never have been born...

Adam and Alice Twisden are not ordinary children. Along with hundreds of other rich and desperate couples, their parents tried an experimental fertility treatment, and paid a horrific cost.

The twins' aunt has finally won her fight for custody, and is determined to give them the love and stability that they have never known. But outside the refuge she is trying to create, dark forces are combining. Troops of other feral offspring roam the New York streets. Their struggle to survive is complicated by both those who wish to destroy them and those who see a way to profit from them.

As the city becomes a battleground, Adam and Alice will have to decide where their loyalties lie. They are determined to remain human - and yet their own unnatural urges are growing ever stronger...