"The coronavirus pandemic is over, but it inspired a sinister plot.
As a bruised, wary world tries to return to something resembling normal, the CIA’s Katrina Leonidivna and her Dangerous Clique team are in hot pursuit of a rogue Iranian spy with ties to the now-mostly-forgotten Atarsa terrorist group. But that spy reveals a terrifying new threat: someone calling himself Hell-Summoner has approached Tehran – and other rogue regimes – offering to sell them a deadly virus that would make the first pandemic look tame and plunge a world already on the brink into total chaos."