Awesome conclusion/spinoff of the Little Brother story arc. This one focusing on Masha, a hacker involved on supplying surveillance companies and military contractors with tech to spy and control the general population.
A really insightful look into the dark side of tech, and the moral complexities of the people involved in it. It uses the whole story as a really clear introduction to tech concepts like cryptography, man-in-the-middle attacks, virtual machines and so on.
Definitely a required reading for survival in the age of surveillance capitalism and the horrors it brings.