Hybrids: Volume Three of The Neanderthal Parallax

Scientists (and lovers) Mary Vaughan, who is human, and Ponter Boddit, who is Neanderthal, embark on the harrowing adventure of conceiving a child together. To overcome the genetic barbed wire of mismatched chromosomes, they must use banned technology obtainable only from a Neanderthal scientist living in the northern wilderness.