Five On Kirrin Island Again is the sixth novel in the Famous Five series by Enid Blyton.

George is frustrated with this idea, but agrees to lend her island to her father until he completes his experiment.

Uncle Quentin is later kidnapped by villains wanting his secret formula for alternative energy.

During the adventure, Timmy plays an essential part in rescuing Uncle Quentin from the kidnappers.

The children befriend an artistic boy named Martin, whose guardian, Mr Curton, is part of the gang trying to steal the secret formula.