Synopsis: Can interspecies diplomacy begin in the womb? After seventy years on Tofarn, the human colonists and the native Tofa still know very little about each other. Misunderstanding breed conflict, and the conflicts are escalating. Scientist Mara Cadell's radical proposal: that host mothers of either species carry fraternal twins, human and Tofa, in the hope that the bond between twins can bridge the gap between species. Mara lost her own twin, Levi, in utero, but she has secretly kept him alive in her mind as companion and collaborator. Mara succeeds in obtaining governmental backing for her project – but both the human and Tofa establishments have their own agendas. Mara must shepherd the Twin-Bred through dangers she anticipated and others that even the canny Levi could not foresee. Will the Twin-Bred bring peace, war, or something else entirely?