FINALIST IN THE 2021 WISHING SHELF AWARDS (books for 9-12 year olds category). "Loved it, I read it in a day", "funny and awesome", "super fun", "really good book". Marty is desperate for friends, having left his behind when he moved into 10 Downing Street with his mum. Bored and lonely, his life suddenly becomes a lot more exciting when he sneaks out of a secret passage...