X-Factor: Secret Invasion

In the midst of Marvel's 2008 "Secret Invasion" event, this single-issue tie-in from 2009 catches up with X-Factor Investigations as the Skrull infiltration threatens even mutantkind. Written with a sharp, paranoid edge, the story is brought to life by artist Boo Cook's distinctive, moody visuals. It's a compact, self-contained snapshot of how a street-level mutant detective agency navigates a crisis where no one can be trusted.