Dark Tower: Treachery (Dark Tower: Treachery #6)

In this final issue of the arc, Cort, the trainer of gunslingers announces that Gilead has been infiltrated. The man responsible is one of John Farson's spies and most likely has not been working alone. And the ultimate goal of the infiltration is the theft of the immensely powerful mystical object which Roland Deschain stole and brought to Gilead - Maerlyn's Grapefruit!