Clean Room has really found itself in this third volume. The mysteries are starting to become clear, the characters are crystallizing. It's all starting to make sense. And that gives Simone the ability to step off the main path a bit. So we get a story about an obsessive serial killer and we get a wonderful one-off issue about how Astrid has touched other lives. 
 It's a terrific middle volume. 
 Oh, hey. Suddenly it's an end volume. The storyline does feel like it moves toward that ending organically, but it's all very rapid and it's obvious that much more had originally been intended. 
 Ah well, it's a fine end to a fine comic that was on the edge of becoming superior.