Lin and Kris are competing for the best grade on their science papers, but as the due date draws near, Lin suspects foul play when her chief resource, a library book, suddenly disappears.
Rick refused to wear his hearing aid on his first day at Carter High because he was afraid the other students would not want to be his friend if they knew he had a hearing problem.
Drake knows how important it is that he pass Mrs. Wray's history test, so he is baffled when the exam goes missing after he turns it in, and must work fast to prove someone else had a hand in its disappearance.
Logan's lie about liking to break codes comes back to haunt him when Quinn gives him a message to decode, and he must either figure out the code or tell Quinn the truth.
One day before the big art show, the painting Paige was planning to submit goes missing and Paige wonders if she misplaced it or if someone is trying to get rid of the competition.