Duncan's wedding day brings a welcome surprise — and provides the perfect opportunity for uninvited guests to search the house. Bode discovers a new key.

Bode looks for the key that will let him see his dad, Nina confronts bad memories, and Kinsey gathers with the Savinis for an emotional send-off.

Bode's sudden attitude change worries his family and friends, Tyler catches up with a co-worker, and Gideon forms an unholy alliance.

Suspicions about Bode's behavior come to a head after an unsettling discovery, while Gideon's patience runs out in his plot to possess the keys.

Gideon's henchman grabs leverage to use against the Lockes as Tyler and Kinsey look for a way to help Bode, who's devising a clever plan of his own.

Gideon forces Ellie to take him to the missing key, putting an old classmate's life on the line. Nina and Bode attempt to unlock the Harlequin Chest.

With Gideon hell-bent on acquiring the Creation Key, the Lockes race to stop him, leading to a vicious clash — and a decision that changes everything.