So Atom gets killed, only I suspect he actually is alive. Patiently waiting for him to save the day in the last volume. Meanwhile Geistch gets assigned to being body guard to the man looking to kill him. Through their conversations, Geistch learns about the secret fascist group looking to kill all robots.
This book also introduces Atom's creator who they implicate in creating the perfect robot who is NOT Atom. Presumably he created this PLUTO.
I can't wait to find out how it all ends. I am about to read Volume 5 !