For countless generations the sword had been kept hidden, ready for a time of need. But not hidden well enough, because on one warm July night in 1937 it vanished — its disappearance swallowed up in the storm clouds of war that would soon engulf the world.

1941 — twelve SS generals gather at a castle in East Prussia to re-enact an ancient rite and call on the spirits of Europe's mightiest warriors to aid them in the coming battle in the East. At the heart of the ritual is a pentagram formed by five swords. One of them is Excalibur, the mythical weapon pulled from a stone by King Arthur.

2010 — Art recovery expert Jamie Saintclair laughs when he reads the codex to a German war veteran's will, the strange ritual it describes and the mention of a sword named Excalibur. But collector Adam Steele is convinced — and if Jamie can find the legendary sword, he will pay a small fortune for it. The hunt for Excalibur takes Jamie from Germany to eastern Poland and a deadly encounter in Hitler's Wolf's Lair. The castle has been destroyed down to the last stone and the only clue to the sword's fate is the strange tale of a wartime partisan unit murdered by its own commander.

With a team of international assassins on his trail and the distinction between friend and enemy a blur, Jamie finally makes it back to a Britain under siege, where the last piece of the puzzle falls into place and he discovers that the line between obsession and madness is gossamer thin…