When Liam Evans, a Professor of Philosophy, withdraws to his remote mountain lodge after his mother’s death, he expects nothing but silence and the unfinished pages of his dissertation. What greets him instead is Sandra Livingston, a literature teacher who claims the same house as her own, on a planet with two moons.

As an inexplicable clock governs the passage between their worlds, and a mysterious old man named Adam moves through both like a shadow, Liam and Sandra must navigate an existence split between Earth and Terra. Identities fracture, histories intertwine, and a cryptic riddle surfaces: When a paradox arises in creation, discontinuities are produced. When two paradoxes coincide, a boundary balance is required so they do not dissolve.

The clock, it seems, has its own agenda.