With the Warehouse now destroyed. Pete, Myka, Artie, and Claudia race around the world in a race against time to bring back the Warehouse.
In France, Artie and Claudia find Magellan's artifact that has the power to turn back time, but they need another piece that's in the Vatican. Claudia becomes trapped, but she tells them to go since she won't remember this anyway.
To get inside the Vatican, Myka draws attention away from Pete and Artie and gets arrested. Pete and Artie find the final artifact, but Brother Adrian stabs Pete.
Artie turns back time and saves the Warehouse, but Adrian's warning that a great personal cost is still on his mind. Artie dreams of Claudia stabbing him.
Mrs. Frederick wonders what Artie is up to after she finds a streak of gray in her hair.
Leena calls Artie to tell him that Claudia has left with the metronome in hand.
Claudia: That's why it's a 24-hour stopwatch because Magellan was the first one to sail all around the world. Artie: So you actually paid attention in fifth grade? Claudia: Yes, now think back to your youth, and try to remember what he said to you on deck the night he crossed the International Date Line.