This volume collects Action Comics issues #866-870 and Superman: New Krypton Special #1. The story starts "35 years ago" on Krypton, as Zod watches helplessly as something that we know as Brainiac steals the city of Kandor. This sets the background for the story of Zod, someone we only know as a super-villain, but who has his own version of events, one that will unfold across the `New Krypton' storyline that appears to begin here (but possibly began with the earlier `Superman and the Legion of Superheroes' storyline...). Meanwhile, "today" a Brainiac probe arrives on earth and encounters Superman. That information is relayed back to the mothership, and attempt #242 to locate earth is instigated. Apparently, although Brainiac has encountered Superman before, it has always happened `remotely', and Brainiac doesn't yet know the location of Earth. [Note - without a reference book to hand, `242' sounds remarkably like the issue number of Action Comics that first featured Brainiac.] After reviewing history files from krypton, Superman goes looking for Brainiac, and finds him, and also the chamber of cities in his mothership; but Brainiac also finds Earth, and steals Metropolis...
This is an excellent adventure, tidying up the history of Brainiac, Krypton, Kandor and Argo City, while moving ahead with the current world of Metropolis, and also beginning the `final' storyline before the `New 52' reset of the DC Universe - think of Alan Moore's finale to the Silver Age Superman series - this is the beginning of the end of the `Iron Age' Superman, and it is just as good - if rather longer.