In 1989, Lila digs up one of her mother's secrets. The families join forces to fight the Kugelblitz. Reginald teaches Klaus to harness his powers.

With the universe collapsing around them, the gang gathers for a day of romance, awkwardness and debauchery at the Hotel Obsidian.

Reginald goes all out to convince the children to sign on to his plan. Five tries to recover a drunken memory. Allison has a change of heart.

Shaken, the family confronts the deadly mysteries of the Hotel Oblivion — and the growing suspicion that their mission is not what it seems.