Tantalising Trailers: The Thirteen Hallows by Michael Scott and Colette Freedman

Title: The Thirteen Hallows

Series: The Thirteen Hallows

Author: Michael Scott and Colette Freedman

Publisher: Tor Books

Publication Date: 6 Dec 2011 (in US)

Synopsis from Goodreads

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… nd a horror beyond imagining.  

Seriously how awesome does that sound. I love The Secrets of the Immortal Nicholas Flamel series.