Collects X-MEN (2021) #4, NEW MUTANTS (2019) #22-23 and WOLVERINE (2020) #17-18. Heads will roll in the Trials of X! It's Halloween, and the X-Men have to face a horror born of a neighboring town in Westchester: the Headless Horseman?! And that's not the only terror targeting them! On Krakoa, where the dead walk among the living and the unforgiveable has been forgiven, the New Mutants must battle an old foe: the psychic entity known as the Shadow King! Meanwhile, Maverick returns for a team-up with Wolverine! But when C.I.A. agent Jeff Bannister uncovers a secret surveillance device aimed at Krakoa, Logan faces a life-or-death protection mission on the run - with nowhere safe to hide!