The Stonekeeper by Kazu Kibuishi

View fullsize

When Emily, her brother Navin, and their mother move into an old family home, they expect to face a lot of cleaning and repair work. They don’t expect to hear strange noises from behind the basement door, nor for a tentacle monster to kidnap their mother!  It’s up to Emily and Navin to figure out how to set things right and save their mother’s life.