Duncan Quagmire is one of the Quagmire triplets, along with his twin sister and brother, Isadora Quagmire and Quigley Quagmire. They were orphaned after their parents were killed in a fire. Caught in a similar plight to that of the Baudelaires, the Quagmires are heirs to a large fortune of the Quagmire sapphires, which Count Olaf is determined to claim for himself. He captures Duncan and Isadora at the end of The Austere Academy and keeps them in his clutches until the end of The Vile Village, where they escape with Hector in his Self-Sustaining Hot Air Mobile Home. After the home crashes, Duncan's fate is left ambiguous.