Can interspecies diplomacy begin in the womb?... After seventy years on Tofarn, the human colonists still know almost nothing about the native Tofa. Misunderstandings breed conflict, and the conflicts are escalating. Scientist Mara Cadell’s radical proposal: that host mothers carry fraternal twins, one human and one Tofa, who might understand each other better. But will the Twin-Bred bring peace, war, or something else entirely?