Several aid organisations, journalists, and other bodies across the world were attacked, with almost all of their staff massacred. On paper, these raids were independent of one another and conducted by local militias, but the real culprits were augmented human beings working under the organisation YHWH, bions, in what was a targeted purge of cells possibly related to the secret coalition of nonprofits ISCARIOT. A pacifistic bion called Eva Fly is made by her most trusted ally, Irena Malczewska, to work with a team of two other bions -- crossbow sharpshooter Joshua Akindele and convict Pieter Jaggi -- getting acquainted with their natures, in the interests of a man who claims to be an FBI agent: Walsingham. On their first name, they retrieve a freshly-converted bion and name her Robin.
With their first few operations proving useful enough, Walsingham opts to let the five run free in some American city, but their drive there is interrupted by YHWH operative Jonas McKenna. However, Jonas grows unhappy with YHWH after his fellow operative in the area begins to act too ambitiously. It just so happens that Robin was an experiment, who was greatly fearful of the operative's abilities.
The three-strong team grows to five after Irena augments herself to become a bion and Robin advances past her fears. Walsingham warns of a mission only the five operatives can take.