Four people in Chicago, one weekend in June, all go to the same gift shop in the Galleria and examine an ornamental crystal wand. Rock star Marshall Storme, fantasy author Evan Stone, architect Valaura Bennet and fast-food worker Lillian Curtis all look at the wand, though only Marshall and Valaura are seriously interested in purchasing it. They are all transported to a parallel dimension, a place where the myths of earth originated, and live as real, if unusual, beings.
Befriended by the Daemona, the four dimension travellers find themselves embroiled in a holy war with the savage Anjeles. Lead by the mad King Yahoo, the Anjeles are trying to wipe out the Daemona and their four brother-kings, Nicholas, Mephistopheles, Beelzebub and Lucifer. It is Lucifer, King of The Land of the Chalice and the Lightbearers, who is the nemesis of King Yahoo. But they have gone to war against the eldest brother, Nicholas, and the four travellers are caught right in the middle.
Marshall Storme and his friends resemble a prophecy laid down in The Pentacular, the Daemona book of wisdom. Marshall is The Savior, he who was sent to lead the Daemona into their holy war and liberate Paradiso, the mountain stronghold of the Anjeles. This is complicated by the fact that Marshall is a pacifist by nature, and believes war is wrong. But borne along on a tide of friendship, coercion and confusion, Marshall finds himself in the role of arbitrator.
This occurs when Sterling, prince of The Land of the Cup, falls in love with Ariel, daughter of Yahoo and a political prisoner. They throw everyone's plans into the dumpster when they become lovers and Ariel is pregnant. Since the Daemona only conceive children after the telepathic union of minds, it is made clear to everyone except her insane father that this is a match to be honored.
Marshall and Lillian Curtis become lovers first, creating more problems for themselves than are solved. Evan and Valaura begin as less than friends, and wind up in love, but again their circumstances make it all rather difficult. They do eventually get back to their own world through most drastic means, only to discover that no time has passed while they were gone, and they must now find their fellow-travellers in Chicago.