While Nina uncovers details about Rendell's past, Kinsey helps out the Savini Squad, Tyler falls in with a bad crowd, and Bode finds another key.

Locating a powerful new key sends Bode's spirit soaring. Tyler's simmering rage boils over. Kinsey realizes just how much her fear is holding her back.

Sporting a new hairdo and attitude, Kinsey takes a chance with Scot by sharing what's going on inside her head. Tyler tries to impress his crush.

Kinsey uses a key to seek vengeance on a school bully. A troubled Nina finds a sympathetic ear. A long-buried memory casts Rendell in a new light.

Kinsey explores the sea cave with the Savini Squad in tow, Nina confronts Ellie over Joe, and Tyler sabotages his relationship with Jackie.

The Locke family faces their worst nightmare when the person responsible for shattering their lives resurfaces and demands one of the keys.

Tyler and Kinsey feel torn when they figure out why Nina is acting strangely. Bode meets Rufus and Ellie's houseguest. Dodge zeroes in on the Omega Key.

As pieces begin to click into place for the Locke siblings, Ellie opens up about her connection to Dodge, and Kinsey comes clean with her friends.

The battle over the Omega Key leads to decisions that can't be undone — and a dangerous door that promises plenty of trouble ahead.