Gabby heads out on a road trip with her Grandma Gigi to the urban wonderland of Cat Francisco. But when Gabby's dollhouse, her most prized possession, ends up in the hands of an eccentric cat lady named Vera, Gabby sets off on an adventure through the real world to get the Gabby Cats back together and save the dollhouse before it's too late.
Lincoln and the Louds are ecstatic to welcome their new Gran-Gran, Myrtle, into the family with a tropical wedding celebration; but the festivities are cut short when an old nemesis from Myrtle's secret agent past appears on the island.
Ethan inherits a large house outside of town and suggests to some friends that they move in together. At first, the cohabitation works well, but later relationship problems and unresolved feelings are revealed. Everything is brought to a head when Kate, who has feelings for Ethan, appears and several of the friends are forced to make decisive decisions.