When the Amish community of Stone Mill, Pennsylvania, refuses to discuss a murder with the police, it's up to Rachel Mast to bridge the cultural gap and stop a killer from striking again. . .

While swimming in a local quarry, Rachel and her cousin Mary Aaron discover the body of an Amish girl, fully clothed in her white bonnet, floating face down in the water. The drowned young woman, Beth Glick, had left Stone Mill and her Old Order Amish life a year ago, causing her to be shunned by her family and her people.

But if Beth had joined the English world, why was she found dressed in Amish clothing and strangled? Rachel's boyfriend, police detective Evan Park, is getting nowhere with questioning Beth's family. He's also troubled over the fate of three other Amish girls who left Stone Mill in the last two years. As someone who gave up the Plain lifestyle herself then returned to operate a B&B, Rachel is able to use her ties to the community to learn more about the missing girls. But when her search eventually leads to the dark underbelly of the secular world, Rachel finds her own life in dire jeopardy. . .