Aspiring PI Jolene Kelley is skipping class at her fancy new private school, North Shore Prep, when she witnesses her beloved guidance counselor fall in front of an oncoming L train. The police call Mr. Medina's death a tragic accident, but Jo know what she saw: This was murder. With help from her friends Sabrina and Frankie -- and the inside scoop from her public-defender parents and her mentor at the state's attorney office--Jo opens up her own investigation into Mr. Medina's death. Jo's investigation uncovers a scandal at North Shore Prep. Mr. Medina had found out about it, and now he is dead. Jo has a slew of suspects, including administrators, students, parents, and even local politicians. Can she figure out which one the killer is before she becomes their next victim?