Light Beneath Ferns — Anne Spollen

Elizah Rayne is nothing like other fourteen-year-old girls. More interested in bird bones than people, she wraps herself in silence. Trying to escape the shadow of her gambler father, Elizah and her mother move into an old house that borders a cemetery. All her mother wants is for them to have normal lives. But that becomes impossible for Elizah when she finds a human jawbone by the river and meets Nathaniel, a strangely hypnotic and mysterious boy who draws Elizah into his world.

Only by forgetting everything she knows can Elizah understand the truth about Nathaniel--and discover an unimaginable secret.