In the culmination of years of planning, the devious Mister Sinister finally makes his move, and the X-Men are caught right in the center of it! From his vaunted position on the Quiet Council of Krakoa, Mister Sinister has plotted and schemed. Now, at last, his plans come to fruition beyond his wildest dreams... and his darkest nightmares! Can the X-Men survive the experience? Can anyone?
— Description from Comic Vine community (comicvine.gamespot.com · https://comicvine.gamespot.com/sins-of-sinister/4050-153615/).
