Unicorns roam the uplands of Libby Quarrels' mountain ranch. When Libby takes the AIDS-afflicted Bo Gavin out of exile in Atlanta to live with her in Colorado, she sees no connection between his disease and the fantastic secret she guards. But it so happens the unicorns suffer from a plague of their own, and the alternate world that touches the high country has unleashed magic sinister as well as marvelous. While Libby's Indian ranch hand Sam is stalked...