Every year, at the start of the summer holidays, Uncle Cosmo sends his nieces and nephews a gigantic parcel. It comes all the way from Africa to arrive on their doorstep in London. This year it is late, and when it finally arrives it brings with it a great mystery and a terrific adventure. Uncle Cosmo is in danger, and the children must follow the clues to save him.

'Phenomenal...' Rebecca Schillings, author of Lenilotte Loves to Dance.

'It's funny and comical and fills you up like you're eating chocolate.' Ollie, aged 11.