Keith Carter doesn't like being a werewolf -- he is doubtful of the mating theory even though his mother is about to marry her true mate soon, unenthusiastic about living in a communal pack and already has a boy in mind that he wants to love just like other normal teenagers. But his principles are disrupted once he sets his eyes on Nathan Drew, a flirty fellow shape-shifter friend that he meets in his new high school.
Counting down days till his father's wedding with his true mate, Nathan unleashes an odd ability that allows him to sense and interpret thoughts and moods of those around him, and this leads to an alarming discovery that he may a psychic, a kind of immortal that is always known as nonexistent for centuries and apparently is actively hunted down by dark magicians to be kept as slaves. The stakes are higher knowing that having a mate bond will only make Nathan stronger and desirable for the magicians, especially when he finds out that Keith Carter, his stepbrother-to-be, is his true mate.
Upside Down is an inventive revisit of the previous story, continuing the saga's adventure of romance, magic, friendship and family dynamics.