About the Book: Ava and Luke return with another thrilling mystery to solve in this interactive children’s crime adventure from Janice Hallett. When a school trip to an old museum ends with a shocking discovery—a decades-old unsolved murder—they begin investigating using hidden clues from workbooks, records, recordings, and letters. As they piece together the evidence, they must uncover the truth behind the body found in the basement before the killer strikes again. Filled with secrets, puzzles, and twists, this engaging mystery invites young readers to become detectives and solve the case alongside the characters.