This fourth volume deals with different characters as Tim-21, Tim-22, Effie, Driller all end up in situations which seem to be finally bringing this storyline to a close. The conflict between machines and lifeforms is reaching a climax as both sides flex their muscles, hopefully concluded in the next volume.
The characters are developed well and makes the whole experience enjoyable. The artwork can be frustrating some times but is generally work a look. Worth a look, especially if you've read the three previous volumes.