The armies of Atlantis face the Agents of Atlas in a showdown destined to shake allegiances and break hearts! Amadeus Cho, Silk, Wave, Shang-Chi and their allies survived the War of the Realms and now protect the Portal City of Pan. But when a terrible secret incurs Atlantean King Namor's wrath, the team may be torn asunder while war rages - and the water boils!

As battle commences, Brawn takes on the Sub-Mariner! Sword Master and Shang-Chi go undercover! Wave finds herself caught between the surface world and the undersea realm of Atlantis! And prepare for the glorious return of Jimmy Woo and the original Agents of Atlas! But who are the Sirenas?

In a titanic tale of love and betrayal, heroes and monsters, gods and underdogs, one empire will triumph - and one will fall!