Otto has recently found out that he is an undercover agent. So Aunts FiFi and FooFoo have decided to take him on a relaxing vacation to the Grand Canyon. That's not so easy in the secret agent business. They must all don disguises, including Racecar, who has been transformed into an ice cream truck.
But Otto soon srevocsid* that trouble looms near - in the form of a large girl with a Snoopy tent and 10,000 sticks of dynamite! It's time to put his new role to the test.
*srevocsid is backwards for discovers