Fausto is a Crim who is good friends with Zane. When it comes time for Tally and Zane to escape from the city to go to the New Smoke, Fausto is a part of the planning. Fausto helps Tally and Zane find a way to remove their interactive cuffs and he jumps from a hot air balloon with Zane. When Tally finally reaches New Smoke, it is Fausto who takes her to Zane and explains his medical condition.
