In twelve stories originally published in magazines and anthologies, characters find themselves skirting the often uncertain boundary between this world and others, by choice, by chance, or by coercion.Warriors fight battles they didn't sign on to fight. Androids grapple with humanity. Teachers, artists, scientists, and a housewife encounter realities they never knew existed.From ancient Roman Britain to the moons of Jupiter, from Scotland to Tibet to your own back yard, from this world to ones that never existed, these stories take you for a wild ride along the rim of time, space, and imagination.