Claudia and Steve get an intruder alert, which leads them to the shocking reveal that Paracelsus is alive and in the Warehouse. Meanwhile, Pete, Myka and Artie hunt down artifacts stolen by pirates centuries ago. To find the cache, they team up with the mysterious Charlotte Dupres whose agenda puts all their lives in danger.

Pete and Myka are hot on the historical trail of pirate Roaring Dan Seavey, who engineered the theft of artifacts from Warehouse 12.