Superior Saturday (The Keys to the Kingdom)

In this penultimate installment of the series, the young and unlikely hero Arthur Penhaligon faces his most dangerous challenge yet. Having already reclaimed five of the powerful Keys to the House, he must now confront the oldest and most dangerous Trustee: Superior Saturday. Saturday is a master sorcerer who commands legions of magical forces and is fully prepared to destroy the House to execute her own grand schemes. With his allies proving unreliable and his home city on Earth under severe attack, Arthur must find a way to infiltrate the secure Upper House, claim the final segments of the Will, and secure the Sixth Key before everything crumbles around him.