The Dark Tower

The final days of Roland Deschain and his friends are approaching.
The Dark Tower is getting closer…
But now the last of the gunslingers faces a new threat.
The demon-child Mordred, to whom the forces of Darkness have foretold the fate of Roland's killer, has grown up - and is ready to carry out his mission.
Does all existence serve the Beam?
Does all existence serve the Crimson King?
The answer to this question is in the last book of the legendary series 'The Dark Tower'!