Ella finds herself landing smack in the middle of an amusement park. But something isn’t right. Someone has tied Felix to the airship – perhaps the same people who summoned Ella? And General Pronto Speed is looking for revenge. It turns out that the theme park is missing its main attraction: Rusty the Roach, the world’s fastest racing roach, is gone. Pronto Speed tries to put the blame on The Explorers’ Club and Ella and Felix are forced to save both the amusement park and their own reputation.

The Explorers’ Club and Rusty the Roach is the seventh installment in The Explorers’ Club series.