Will Solvit and the Dreaded Droids

Will Solvit and the Dreaded Droids is the fourth book in the Will Solvit series.

Synopsis
When Will Solvit' 'decides to travel to Antarctica to seek out famous inventor Dr Demonax he discovers: But these are no ordinary penguins and Will and Zoe take their biggest mission to date.
 * Three cryptic clues
 * One supersonic plane
 * One secret door
 * An army of penguins