The Sunken Mall takes place after the events of The Last Sun. In an effort to more fully integrate their ward Max into the family, Rune and Brand endeavor to find Equinox gifts for the teenager. Their gift plans are shaped by Quinn, the teenager seer, who orchestrates a shopping expedition into the Worcester Galleria, a translocated mall magically-preserved as it was in the early 1980s. With the help of the Principality, Ciaran, and Rune’s new boyfriend, Addam, they find that the mall has taken on an unexpected life of its own.