Paint by Magic (Time Travel Mysteries)

Something is terribly wrong with Connor's mom--she keeps slipping into bizarre trances. Connor suspects that the key to his mom's strange behavior is an old art book filled with paintings of a woman who looks exactly like her. But the artist who created those paintings died before his mom was evenborn.
Connor gets his chance to break the evil link between the past and the present when he is mysteriously whisked back in time to the 1920s. But can he save his mom--and himself--before it's too late?