Sabotage Surrender — Carolyn Keene

It's time for the final ceremony of the River Heights Celebration, where four candidates are going for the Mahoney Scholarship. All four are equally qualified--and equally worthy suspects behind the strange occurrences that have been happening at the carnival. Arson, theft and threatening notes all combine to provide a stunning conclusion to the Sabotage Mystery Trilogy. Can Nancy finally figure out the saboteur--before it's too late?