After 16-year-old Tara finds her birth mother Grace on a DNA website, her dedicated adoptive mother Amy struggles to protect her daughter as the wildly unpredictable birthmother crashes into their lives with erratic love for Tara and toxic hatred toward Amy. But is Grace really who she says she is? As Tara grows closer to hot and cold Grace, Amy begins to wonder if Grace has either a severe mental disorder or is there another secret buried, as Grace seems hell-bent on eliminating Amy and reclaiming Tara.