Jack's Granny is sick with a bad case of the moozles! The only cure is the fruit of the fantastic flumflum tree which grows on the faraway Isle of Blowyernose. It's a perilous journey, but Jack bravely sets sail, with a motley crew of only three—and a large patchwork sack that Granny has filled with an odd assortment of items from chewing-gum to tent pegs. But what use will they be against hungry sharks, a leaky, boat and a thieving monkey?