Marvel's latest X-Men one-shot opens with an opulent masquerade gala filled with romantic entanglements among the mutant cast before pivoting into darker territory when Sebastian Shaw is discovered dead. The investigation that follows, led by Wolverine and Jubilee, suggests a newly formed Brotherhood of Mutants killed Shaw to prevent him from using a genocidal weapon, with Wolverine deliberately withholding this information from others.

The story's final scene complicates the apparent resolution when Wolverine hints to Emma Frost that Shaw's death may not match the Brotherhood's explanation, implying a telepath might be responsible instead. This murder carries extra significance because Krakoa's fall has restored genuine consequences to death for mutants, making Shaw's demise potentially permanent and elevating its importance as the X-Men's most notable loss since the conclusion of the Krakoan era.