ASTONISHING X-MEN #27

Astonishing X-Men #27 (Marvel Comics, 2009). In "Ghost Box, Part 3," with S.W.O.R.D. Agent Brand's help, the X-Men learn the mysterious cube is a Ghost Box — technology from a parallel world — and that the murder victim was a mutant from another universe. Following clues to a place called Tian in China, they discover the ruined home of the Chinese X-Men.