Tinker, Tailor, Mutant Spy — Brian K. Vaughan

The end of the series about the ambiguous shapeshifter Raven Darkholme, and her dangerous games. There are a few shorter stories here, of the more self-contained variety.

An interesting series that unfortunately didn't continue, and probably should have been a MAX title to get to its full potential. Bisexual shapeshifting spy/assassin/villain/mothers are not your standard sort of Spider-Man type adventure characters.