Mrs. Stevenson has had it with your class. On the last day of school before Summer Break, she walked out of the door and locked it behind her. You remember your best friend telling you something about swiping a library card through a door’s lock to get it open—and this amateur lockpick might be the only way to save your summer. Mrs. Stevenson locked up your library cards for the year, too. Looks like you’re going to have to solve her strange puzzles if you’re going to earn your vacation this year!