Doubting Thomas — Morris Gleitzman

Thomas is eleven and lives with his mum and dad and big sister Alisha. He was a pretty normal kid until two weeks ago when he discovered he had developed a startling new ability. Every time anyone tells a lie Thomas develops a violent itch in his nipples. It's uncomfortable, embarrassing and gets Thomas into all sorts of trouble and he just wants it to go away. So with the help of his two friends, Holly and Kevin, he sets out to find a cure.

A funny, clever and poignant story about family, travel, and telling the truth from the author of Once and Aristotle's Nostril.