In the far reaches of the Pacific Northwest, three best friends spend a day at the lake...but only two come home. Ten years later, Delia Albio is tormented by the mystery of what happened to fifteen-year-old Zee on the lake that day. When she receives an email from Cara, the remaining friend in the trio, she can't resist the pull of the "life-changing" news in the message. Delia, hopeful for answers, travels home to see her old friend. But Cara is gone by the time she gets there, setting off another mystery. When Delia hears about the women's empowerment group that Cara joined, she sets out for the group's retreat property on the Oregon coast to find her. Delia feels this could be her chance to reconnect with Cara and reckon with that fateful day at the lake. Instead, Delia uncovers a possessive group with a dark agenda. As their leadership closes in, Delia hurtles ever closer to the truth-- if only she can survive a cult that will protect its secrets at any cost.