This work presents a well-developed group of rogues that will make excellent adversaries for your superheroes.
It opens with a couple of pages describing the three people who make up the Triad, their early life and the way they acquired their super-powers, and how they use them to pursue a life of crime. The whole is coherent and (providing you accept the existance of super-powers!) very believable: it's easy to imagine that this could take place.
Each of the three has a full character sheet using the Supers! ruleset, including a colour drawing of each in costume - they go for a uniform red spandex style, as depicted on the cover.
These are followed by a couple of adventure ideas - a bit more developed that mere 'seeds' although you will have to do some prep before running them. Each includes background, the main plot and other adversaries or allies involved as well as the Triad (complete with their character sheets as appropriate). There are also a couple of other adventure seeds you might like to develop for yourself, based on whatever is going on in your campaign. This would, of course, give scope to develop the Triad as an ongoing feature within your game, a nice touch.
Finally, there are paper standee miniatures for the Triad and the two main individuals from the two adventure ideas, all ready to go.
A nice resource to weave in to an ongoing Supers! campaign - or even to start one off!