Mabel is a girl who lives with her mother. They live in Denver,Colorado. Dipper is a boy who lives with his dad . He lives in Portland,Oregon. They both live a normal lives. Until they both go to the same spot located in Gravity Falls,Oregon at the mystery shack. Dipper is there visiting his uncle Stan for the summer while his father is looking for Gravity Falls greatest mystery. Mabel is there because her mom has to take care for her Grandma.