Per the back cover, this is the first expansion for Tiny Supers and covers the Iron Age of comics. DTRPG shows the pdf for $6.99; the softcover for $19.99; the hardcover for $24.99; the softcover combo for $21.99($26.98); and the hardcover combo for $26.99($31.98) at the time of writing. It has 2 chapters, totals 65 pages, and introduces new rules and a new city, Haven City.
Chapter 1 starts with 10 new archetypes. What’s interesting is they all have the “average” trait, meaning they can’t take super powers. Archetypes include: Adept, Crusader, Legend, and Vigilante. The next section covers optional rules for equipment kits and utility belts. Equipment kits include: burglar kits, climber kits, and surveillance kits, and these (as well as utility belts) can be used in lieu of regular traits. Utility belts have 4 - 8 slots and all but the waist utility belt (costs 2 trait slots) cost 1 trait slot. Also, different items for the utility belts take 2 - 4 slots each. Vehicles and their use is next. Different types are listed as well as how to upgrade them, and several upgrades are available.
Chapter 2 is all about Haven City. Haven City is across the bay from Sentry City. Everything was good until the Depression happened and Prohibition was repealed. Superheroic activities and powers are illegal thanks to the Metahuman Apprehension Universal Legislation (MAUL). There are 8 major neighborhoods, not counting ethnic ones (think Chinatown and the like) including Dockside, Diamond Coast, and Bird Park. There are several forms of “law enforcement” in Haven City outside of MAUL, including the only “authorized and licensed superhero,” Indomitable. There are also the obligatory organized crime groups such as the Guttersnipes and Soyuz among others. They also include 6 iconic heroes and a rogues gallery of 10 to get started.
For me, it was a good addition, because if you don’t have enough to work with what with the original source material and supplements, you can play a different type of hero, one who doesn’t have to rely on superpowers. I don’t even think it would be any trouble to incorporate the archetypes into one’s Sentry City sessions, or even one’s own superhero city.