Gunslinger Roland Deschain roams an Old West-like landscape in search of a dark tower, in the hopes that reaching it will preserve his dying world.

In a gritty and alternate 1985 the glory days of costumed vigilantes have been brought to a close by a government crackdown, but after one of the masked veterans is brutally murdered an investigation into the killer is initiated. The reunited heroes set out to prevent their own destruction, but in doing so uncover a sinister plot that puts all of humanity in grave danger.