Power of Suggestion — Carolyn Keene

Nancy and Bess are visiting Ned at college on the weekend of this year's biggest frat party. But tragedy strikes when a research assistant is found dead -- and Parker, Ned's fraternity brother, is the prime suspect. Parker was involved in a study of the subconscious mind, but now somebody has turned it into a mind control experiment! Nancy rushes to get to the bottom of it before someone gets away with murder.