Keys to the Kingdom Books in Order

Arthur Penhaligon is supposed to die young, until a strange key saves his life and drags him into the House. To stop a plague and a terrifying new enemy, he must become a hero fast.

Arthur is pulled from his hospital bed onto a ship bound for the Border Sea, where pirates, storms, and creatures of Nothing await. To save the Secondary Realms, he has to claim the Third Key.

Arthur barely has time to recover before Grim Tuesday's servants begin wrecking both the House and his own world. To stop them, he must return to the Lower House and face a nastier, greedier foe.

Arthur comes home from the Border Sea only to find a double living his life, while he is drafted into the Architect's army. Between military training and a spreading invasion, he has to win the Fourth Key.

Arthur has defeated four Trustees, but the House is still unraveling and people back home are missing. Lady Friday offers a tempting deal, and Arthur has to decide whether it is rescue, trap, or both.

Arthur has five Keys, but the House is still crumbling and the most powerful Trustee is waiting above. To stop Superior Saturday, he must break into the Upper House before everything falls apart.

With six Keys in hand and the House collapsing, Arthur faces his final and strongest opponent. The last book turns the whole strange week into a race to save every world at once.