Astonishing x-men Dangerous trade vol. #2
A tragic death at the Xavier Institute reveals a powerful enemy living among the X-Men that they could never have suspected - and no, it's not Magneto. Things heat up in a way none of the X-Men ever dreamed, but will teamwork save the day when they can't even depend on themselves? Collects Astonishing X-Men #7-12.
Teh 2nd part to Gifted.