Memory of Fire (The World Gates, Book 1)

Lauren Dane discovers a doorway to another reality in Cat Creek, North Carolina -- and she crosses over, driven by a strange compulsion she can neither resist nor comprehend. Molly McColl is brought there against her will -- kidnapped from her trailer and carried into a realm that traps her, terrifies her...yet offers her a strange and wondrous escape.
In an extraordinary universe of magic and monsters, two strangers sharing only pain and loss must now pursue the destiny that has united them. Because worlds are suddenly threatened by an evil beyond imagining -- the world they have entered...and the one the have left behind.