Nelle and Evan Pereira were thrilled to close on their "forever home," a spacious paradise nestled against a state forest in Massachusetts. Three months later, on a brisk Saturday morning, their peace is destroyed when an intruder captures Nelle home by herself. Quickly overpowered by the aggressive stranger, she's forced down to the cold, musty basement where he ties her to a chair. The intruder has a singular, if unusual, demand: he wants her to make a phone call. One that Nelle isn't confident she can make, even though her life depends on it.

Desperate to see herself and her husband to safety, Nelle doesn't yet realize this was no chance encounter--it was a carefully planned attack. With no one to hear them scream, their secluded home feels horrifyingly isolated. And before this long day is through, Nelle and Evan, who share a dangerous secret, will bring a violent reckoning down upon all of them.