His memory erased and his identity shattered, Wolverine finds himself a patient at the Dunwich Sanatorium. Under the care of Dr. Rotwell, Wolverine is tortured by the sadistic guards routinely as part of his ongoing therapy to bring forth, and purge, his inner darkness. The mind games played out against Wolverine are, of course, part of a larger plan, as Rotwell is not quite what he seems.
Writing in a tone of old horror comics, like Tales from the Crypt or an episode of The Twilight Zone, Jason Aaron serves up a gory story of crazed medical experiments where the cure is worse than the disease. It's a particularly fitting story for Wolverine, who has had his brain messed with so many times.