Molly and Brad are still adjusting to life with a newborn. With Brad gone during his 72-hour shifts at the fire department, Molly is crumbling under the stress of raising Ava on her own. She joins a support website for new moms and meets Beth, who becomes the confidante she needs. At first, Beth is a godsend; but the more time she spends with Molly and Ava, the more possessive she becomes. As Beth’s true motives surface, her dark history is revealed—putting Molly and Ava in serious danger.