Primary Fault - The Schattenreich, #1

Caitlin Schwarzbach fears Death. That's her name for the gaunt wraith who haunts her. After leaving small-town Texas for Cologne, Germany, she faces an even bigger fear. Her seismologist brother Gus vanishes, wanted by the Cologne police. Caitlin's search for her brother - and his doppelgänger - earns her a bump on the head and a trip to the hospital. She believes Gus's disappearance and ruined reputation form part of a larger conspiracy.
The police do not agree. Gus remains their primary suspect. With the help of the sexy aristocrat she's fallen for, Caitlin locates a vital witness: her brother's former lover. Can she prove Gus's innocence? When Caitlin arrives late to the rendezvous at Cologne's Gothic cathedral, an earthquake flings her into a bleak Otherworld. She finds the woman she arranged to meet - and a tall, gaunt wraith she has no desire to see.
Primary Fault, Book One of the Schattenreich, a tale of seismology, Druids, and an evil blonde.