They're back! And this time, they've gone across the pond! Set one year after their previous adventure, Adrianna and Tommy's lives are completely upended when Tommy's mother, Terry gets kidnapped under orders from the tyrannical queen of Atlantis, Ceto. Forced from their home following a near-fatal encounter with Ceto's mercenaries, the duo take refuge in London, where they meet the AtlaRes, a group of heroic Atlanteans led by Dr. Laguna (Tommy's biological grandmother and true queen of Atlantis) who seek to rescue Terry and free Atlantis from Ceto's regime. Along the way, Tommy meets his long-lost father, Miles, and discovers his true heritage, while Adrianna is forced to confront a traumatic event in her past when they encounter the Marapax, the mercenaries who killed her father, led by the ruthless Barracuda. WARNING: Contains mild language, violence, and intense action.