Alias: Vigilance (APO Series #6)

Sydney's conscience struggles with her job, which too often asks her to work with criminals she'd much rather put away. She understands the logic -- the small fish versus big fish pragmatism -- but that doesn't make acceptance easier. Someone else is less conflicted and is assassinating APO's shadier contacts. Only the calling card of a black star with the number 13 in its center hints at the culprit.

When it becomes clear that a highly trained -- and lethal -- vigilante organization is i...