Death of an Angel - Fallen Angel Series, #2

Valeria Jensen, a detective with the Las Vegas Police Department, barely managed to survive her encounter with a vengeful killer, but a powerful new threat has emerged. Not long after she and her partner, Matthew Briggs, closed the case on the murderer, she is pulled into a very strange world where she encounters her worst nightmare. With death breathing down her neck, she is forced to find a very deadly item for a very deadly man before his patience runs out. In a desperate attempt to save her life and the life of everyone she cares about, she must journey with death to encounter some old enemies and uncover some new enemies along the way.
With her soul on the line, she may find that not even her angelic powers are enough to prevent the death of an angel.