For FBI agent Patrick Taylor, life is simple: catch the bad guys and bring them to justice. Yet, unknown to him, Patrick is also the descendant of a long line of ancient mystical warriors that utilize the joined magic of fraternal twins. Ignorant of his spiritual heritage, his pedigree is blatantly revealed when he finds himself marked for assassination in an eternal battle between two rival orders.

Dark forces emerge when Patrick's girlfriend, Dr. Courtney Hancock, inadvertently disturbs a long-buried demon during a seemingly routine archeological dig. Worse still, a lunar eclipse occurs on Summer Solstice Night, bringing the cosmic influences into the alignment needed to free this beast. Patrick suddenly finds himself drawn into an ancient crusade against a previously unknown foe and a personal battle to save Courtney from being sacrificed to this demon.