Nemesis. League of Independent Operatives, #4

Mary O'Sullivan's world is on the brink of collapse.  The Enhanced Abilities Enforcement Association is persecuting humans with powers, forcing them to register their talents with the government. With LIO no longer sanctioned, agents swarm the streets in search of the entrance to the league's hidden HQ.  When Mary helps an enhanced teenager to escape across the border, she uncovers a huge community of people trapped in hiding.
With even greater threats lurking among the stars, she must usher them to safety before the EAEA finds them first.