Kid Normal: Greg James and Chris Smith talk about their new book

They're best friends, they both work at Radio 1 and now they've written three books together.

Radio 1 Breakfast presenter, Greg James, and his partner in crime, Chris Smith, have been to Newsround HQ to talk about their new book, Kid Normal and the Shadow Machine.

They talked about writing books, dodgy costumes and played a hilarious game of charades.

Check out De'Graft's interview here.