A boy's casual wish leads him into a dark and mysterious world in this thrilling adventure from the creator of Alex Rider. For Tad Spencer, only son of a fabulously wealthy businessman, every day is like Christmas.

Until he makes the mistake of wishing he was someone else.

The next morning he wakes up as Bob Snarby, trapped in a cruel and squalid funfair world inhabited by hopeless criminals, mysterious fortune tellers and - worst of all - the murderous Finn.

But he's there for a reason, as Tad discovers when he begins to untangle a secret that will introduce him to the most unexpected enemy of all...