The Planet ARcadia has six moons, describing erratic orbits. But once every 52 years, the Moons of ARcadia come together in a constellation that crates havoc on the surface - raging tides, storms . . . and worse. For the inhabitants of Arcadia are themselves affected in some strange way by the unusual gravitic pulls. Or so it would seem. For few on this new, recently colonized world can remember exactly what happened fifty-two years before; those old enough to remember are curiously reticent. And meanwhile the Moons grow closer . . .