The Chrono Gate

When a physicist is accidentally transported to a tenth-century Viking ship, she must hide her true identity to survive among warriors who believe she's a mute spirit sent by lightning. But as she learns their language and customs, she finds herself falling for Torsten Sigurdsson, the fierce leader who embodies everything her sterile future world has lost. When the same experiment that tore her from home begins to tear open the sky itself, Chana discovers the terrible truth.she has to choose between the man she loves and the world she came from.