Five military veterans, best friends since childhood, gather together in a Brooklyn brownstone several months after the end of World War II, and the metaphoric ghosts of their past become all-too-literal.

Winnie's life is less than wonderful one year after saving her town from a psychotic killer on Christmas Eve. When she wishes she was never born, she finds herself magically transported to a nightmarish parallel universe. With the murderous maniac now back, she must team up with a misfit to identify the culprit and get back to her own reality.

Set in a world of only two dimensions inhabited by sentient geometric shapes, the story follows Arthur Square and his ever-curious granddaughter Hex. When a mysterious visitor arrives from Spaceland, Arthur and Hex must come to terms with the truth of the third dimension, risking dire consequences from the evil Circles that have ruled Flatland for a thousand years.