Shadow sister : a novel
(Book)

"Ava grew up in a haunted mansion, envied by all her friends. But when her mother died mysteriously there, the thrills of Blackworth Mansion became nightmares. Ava never accepted that her mother perished from natural causes, but no one would believe her. Seventeen years later, Ava returns home to unravel the truth of her mother’s death—and her own demons quickly follow. Her estranged and vindictive father may be stalking her. Her secretive new sister-in-law lands on her doorstep with troubles of her own. And then there’s the strange girl who may or may not be haunting the grounds. Even Ava’s romance with her first crush is shadowed by her suspicions. When Ava makes a terrifying discovery on the property, she must decide just how far into the past she’s willing to go. Some secrets can be deadly—especially the ones Ava’s kept hidden in the dark." --publisher's website.