Klaus Baudelaire () is a fictional character and one of the three protagonists of Lemony Snicket's A Series of Unfortunate Events series who appears in all thirteen novels. Klaus is the middle child of the Baudelaire orphans; he has an older sister named Violet and a younger sister named Sunny. His sister Violet is the family inventor, Sunny is the family biter (and later chef) and Klaus is the researcher. He is twelve years old at the beginning of the series, and turns thirteen in The Vile Village. By the end of the series, he is fourteen (fifteen years old if you count in Chapter 14). Klaus is the "bookworm" of the family, and his love of books has often helped him save himself and his sisters.