After the events of the Golden Gala, Kya and Basil find themselves trapped in Atlantis under the watchful eye of Mithras and his Deos Minores. With no way out and enemies around every corner, they must rely on their wits to stay alive.
Meanwhile, Hiram, Tiago, and Georgie are left to pick up the pieces of what happened and form a plan to rescue the rest of their team, even if that means aligning themselves with an old enemy who also wants to escape Atlantis.
However, that proves harder to accomplish than they thought, with secrets running deep within Elysium, unlawful experiments beyond their understanding, and new enemies even more dangerous than Mithras watching their every movement.
With the anticipated arrival of the mysterious Elysium agent Sancus, Basil and Kya will have to take matters into their own hands to escape before he arrives.