Margaret's father, unemployed and reclusive, spends all his time in the basement, sparking her concern. He claims to be conducting harmless plant testing, but his behavior becomes increasingly erratic and disturbing. He only says "Stay out of the basement!" and his true intentions remain a mystery. When her mother leaves town, Margaret's worry turns to fear as she and her brother uncover the dark truth lurking beneath their home.

Goosebumps
Margaret's concerns about her father escalate when her mother leaves to care for a relative, fueled by her curiosity about the mysterious projects in his basement and his altered behavior that puzzles her.