It's April Fools' Day at Harwington Middle School. The eighth graders are on guard for mischief, waiting to see who can top last year's classic white-toothpaste-filled-Oreos prank. But fake cockroaches are one thing. Missing math tests -- and the threat of having to retake the test the following day -- are something else. Who could have stolen those tests? Crack open a What Happened? book to investigate a preposterous mystery from four different perspectives. See what the witnesses get right . . . and what they get hilariously wrong. Bet you'll never guess what really happened! Provided by publisher.