Special delivery: Danger!

When Stanley's mother needs the secret ingredient for a special recipe, Stanley mails himself to Mexico to track down its mysterious maker. But when a band of spies threatens to steal the secret, Stanley's simple trip becomes a race against an opponent that even a flat boy like himself can't slip past!!

--- Added from Google Books ---

In this fifth installment of Stanley's international adventures, Stanley is off to Mexico in search of a secret ingredient! Assisted by some new friends, Stanley dodges spies and sails over waterfalls in a Mexican adventure with a surprise twist.