The Thirteen Hallows by Michael Scott and Colette Freedman

Just OK will probably continue with the series but it will not be on my stalker list (ya know like the sequel to The Passage, The Twelve, due out August 28, 2012 - but whose counting???)

Book Description via Amazon.com

A new adult novel from Michael Scott and Colette Freedman...

The Hallows. Ancient artifacts imbued with a primal and deadly power. But are they protectors of this world, or the keys to its destruction?

A gruesome murder in London reveals a sinister plot to uncover a two-thousand-year-old secret.

For decades, the Keepers guarded these Hallows, keeping them safe and hidden and apart from each other. But now the Keepers are being brutally murdered, their prizes stolen, the ancient objects bathed in their blood.

Now, only a few remain.

With her dying breath, one of the Keepers convinces Sarah Miller, a practical stranger, to deliver her Hallow—a broken sword with devastating powers—to her American nephew, Owen.
The duo quickly become suspects in a series of murders as they are chased by both the police and the sadistic Dark Man and his nubile mistress.
As Sarah and Owen search for the surviving Keepers, they unravel the deadly secret the Keepers were charged to protect. The mystery leads Sarah and Owen on a cat-and-mouse chase through England and Wales, and history itself, as they discover that the sword may be the only thing standing between the world… and a horror beyond imagining.
The Thirteen Hallows is the beginning of a spellbinding new saga, a thrilling tale of ancient magic and modern times by a New York Times bestselling author and an award-winning playwright.