Young heroine Karigan hardly has time to regret being expelled from school (for dueling) before finding herself committed to the desperate errand of a murdered Green Rider. The Riders are an elite messenger corps using both horses and magic; the message is a terrible warning. Bad things from bad places are invading this fantasyland, their presence being only part of a devious, sorcery-aided human struggle for the throne. Karigan's wild ride is beset...

Karigan G'Ladheon was a Green Rider, one of the King of Sacoridia's magical messangers. With evil forces at large in the kingdom and the messenger service depleted and weakened, can Karigan reach through the veils of time to get help from the First Rider, a woman who has been dead for a thousand years?