After his bruising encounter with Cyclops and Emma Frost, Professor X is forced to revisit the biggest challenge and the biggest failure of his career: Logan. But the layers of lies hide one last, deadly secret which goes back to the days of the X-Men's founding - and the Professor's timing couldn't possibly be worse! Collects X-Men: Legacy #217-218, Wolverine: Origins #28-30, and X-Men Original Sin One-Shot.