Insurance worker Robert Samson wakes one morning to find the entire world outside his home has vanished overnight, leaving his house suspended in the middle of a vast, dark, featureless void.

With limited tools at his disposal, he sets about examining the void and his place within it, trying to explain its sudden, mysterious appearance. Meanwhile, his total solitude causes him to start looking back on his life, especially the traumatic fallout of a childhood incident involving a young girl named Rainey Day.

Utterly alone, with food and water supplies that are dwindling rapidly, can he find a way out of the void before he loses his mind – or even his life?