Boom!Is a roller-coaster read with spaceships, spies and mortal danger!

Jim and his best friend Charlie weren't looking for adventure, when they decided to bug the staffroom . . . But then they overhear their teachers speaking in a secret language and it's too late to turn back. And now they have to explain to the police, the headmistress and their parents where they've been for a whole week - without mentioning the aliens.

Mark Haddon is an author, illustrator and screenwriter who has written fifteen books for children and won two BAFTAs. His bestselling novel,The Curious Incident of the Dog in the Night-timewon seventeen literary prizes, including the Whitbread Award. His poetry collection,The Talking Horse and the Sad Girl and the Village Under the Sea, was published by Picador in 2005, and his last novel,The Red House, was published by Jonathan Cape in 2012. His most recent title is short story collectionThe Pier Falls.He lives in Oxford.

An explosive and hilarious adventure for younger readers from the bestselling author of The Curious Incident of the Dog in the Night-Time