After the tragic death of their father, Emily and Navin move with their mother to the home of her deceased great-grandfather, but the strange house proves to be dangerous. Before long, a sinister creature lures the kids' mom through a door in the basement. Em and Navin, desperate not to lose her, follow her into an underground world inhabited by demons, robots, and talking animals.
Gargoyle's Embrace by Lisa Carlisle. A gargoyle statue from the goth club turns into a man to protect her from her abusive ex. He only has hours to convince her they have something real before he turns back to stone.