The first-grade classroom is beautifully decorated with pink and red paper hearts for a fun, exciting Valentine's Day party. While passing out the sweet cards, Bradley finds a mysterious, unsigned valentine that tells the entire class to look inside the dark storage closet. When the kids bravely pull open the heavy door, they are completely shocked to discover a real, live rabbit waiting inside a wire cage. At first, finding a furry friend is exciting for the students, but then the poor little bunny becomes very sick and incredibly lonely. Bradley, Brian, Nate, and Lucy know they have to act incredibly fast to save the sweet animal. Join the four friends as they follow the tricky holiday clues to figure out exactly who left the rabbit behind. You will have to work quickly to track down the secret owner and get the bunny the help it needs.