Klaus Baudelaire 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 he is the researcher. He is twelve years old at the beginning of the series and is fourteen by the end of the series. Klaus is the "bookworm" of the family, and his love of books has often helped him save himself and his sisters from Count Olaf, the sinister villain of the series. He tries to research their way out of the Marvelous Marriage in "The Bad Beginning," helped prove that Stephano was really Count Olaf in disguise in "The Reptile Room", and decoded Aunt Josephine's note, leading him and his siblings to Curdled Cave. In The Ersatz Elevator, Klaus helped Violet and Sunny find out what V.F.D means. He also found his book knowledge important when he and his siblings were accused of killing "Count Olaf." From The Vile Village onwards, the Baudelaire orphans use a series of disguises while evading the authorities and Count Olaf's group. Klaus' disguises include: