When Margaret's dad gets fired from his job as a botanist, he begins acting weird and spending all his time down in the basement. But no one seems to notice his odd behavior or hear the strange noises coming from below-except Margaret. She's really scared. Has her father turned into a mad scientist? Her brother, Casey, thinks she's nuts-that is until he finds out that dad has been eating plant food! What is going on? Together Margaret and Casey venture down into the dark, creepy basement to unearth their father's spooky secret...