Haven of Swans, Rock Harbor Series by Colleen Coble and published by Thomas Nelson.
Set in Michigan's rugged and beautiful Upper Peninsula a
woman stands by the side of the road, barefoot and bleeding with a child in her arms. Someone just tried to kill her, but she wouldn't recognize him if she saw his face. She doesn't even remember her own name.
A suburban cop surveys a kitchen in disarray, a chilling note and a woman and child missing. This crime scene is unlike any he has ever seen. The man who calls himself Gideon waits and plans. He sees himself as a destroyer of evil, one who rids the world of abominations. He has already killed five. He will kill again. Somewhere in the wilderness, in a secret geocache near where the wild swans gather, lies the unspeakable clue that links them all together.