Adam, a rich and reclusive financier living in a country house in a rural backwater near Salzburg, Austria, gets a visit from his brother Zachary, from whom he was separated at birth. Zachary quickly pins him to a tree with an ancient spear through the chest. As the wounds miraculously heal, Adam begins to remember his past life as a knight a thousand years ago... but at the same time, the people he knows start dying around him. To save his friends' lives, Adam decides to leave his home and become a wanderering knight errant.

In his travels, Adam meets a young woman recently released from an asylum for the criminally insane. Some years before, she had been framed for a murder she didn't commit... and history seems to be repeating itself, so that she needs Adam's help and protection.

Adam meets a father who is desperately anxious to find his missing daughter, and he helps in the search for her - but he finds out too late that the woman is a psychiatrist and the man is a former patient who is stalking her. Meanwhile, Adam continues the hunt for Zachary's grave and makes a little progress.

Zachary leads Adam into an ancient castle furnished as it would have been a thousand years before and calls up the shade of a fighter who once almost killed Adam long ago. As a result, Adam's memories of his past life get better. In particular, he remembers the Lady Clare, who nursed him after the fight and whom he planned to marry. Then Adam realizes he still loves her.

The present-day Clare, who is a photographer living in Spain, is planning to marry her Spanish boyfriend, but Zachary steps in to stop the marriage from happening. Clare cancels her wedding, to the distress of her parents. Meanwhile, Adam finds out that in his past life he did marry Clare, and Zachary plans a kidnapping. Clare meets Adam and does not understand how she knows him. Adam helps to rescue her and departs - but Clare makes up her mind to find him again.

Clare catches up with Adam and tags along with him. Zachary plans to grab Adam's sword, using Beatrice, who poses as a worried Spanish mother, to trick him. Adam and Zachary meet for the second time in their present lives. They come face to face in a bull ring, and Adam loses a stone from his sword - but he does not recognize the significance of it.

Adam gets mixed up in a troubled love story and helps to solve the lovers' problems. In talking to Clare, Adam remembers that his brother's grave is in England, so he sets off to go there. Clare stays behind with her parents.

Zachary's man in London's Chinatown is fighting for control of a local restaurant and the owner's daughter. Adam takes sides against him, heading for the gangster's offices in the Docklands when the villain abducts the girl. Meanwhile, Adam's assistant Mathias gets a message which will take their search in the direction of the ancient city of York.

Adam is now in Yorkshire and believes he is getting near to his brother's grave. He runs into two car thieves and also meets a woman caled Fay who has gone blind as a result of the shock of her parents being killed in a road accident. Adam's sight also begins to blur, and he realizes that there is an important connection between Fay and the two car thieves. Meanwhile, the hunt for the grave continues.

Clare travels to Yorkshire to join Adam. In a flashback to the tenth century, Princess Beatrice, daughter of the King, travels to Yorkshire on her father's orders to marry Zachary. On the way there, she breaks her journey at Lady Clare's castle and meets and falls for Adam, who rejects her. In fury, Beatrice burns down the castle. Returning to the twentieth century, one thousand years on, a shopping mall stands on the site of Clare's castle, and there the present-day Clare and Beatrice meet again. Meanwhile, a chemical plant owned by Adam is blamed for toxic waste - but Zachary is distorting the truth for his own purposes.

Everyone converges on the ruins of Fenton Abbey, Yorkshire, at the heart of Adam and Zachary's ancient feudal lands, for a showdown. On the way there, a young man tries to kill himself by jumping out of a train, and Adam stops him. Back in the tenth century, Beatrice travels on towards her wedding with Zachary, meets him, and plans her revenge on Adam. The brothers come face to face again, and Beatrice offers Adam the Book, but he refuses. The Book, together with the Stone, is a source of great power... In the present day, the Book is lost, like Zachary's grave, but Adam is getting very near to finding the answers he needs.

Past and present converge. In the tenth century, Adam rejected Beatrice, so she had him killed, after his showdown with Zachary and his wedding to Clare. Adam sees into the past and finds he was drugged, to become a sacrifice to Zachary's dream of immortality... Back in the present, Adam finally finds his brother's grave, and the Stone, but not the Book. Zachary goes off to find it...