WHAT YOU NEED TO KNOW: The Big House is a generic supplement by Scaldcrow Games that you can use as a superpowered prison for any supers RPG. It is 48 pages and stat-free, although it does have a system of icons to help you gauge how a given NPC should compare to your PCs experience-wise, as well as the level of threat they should pose. Similarly, important skills for each NPC are given on a 1-10 scale that you can use to judge where it would fall in your system of choice. A full map of the prison is included, with staff, security measures and so on, plus a handful of adventure seeds and a big worksheet of the cellblocks so you can track who is locked up where.
WHAT WORKS: I love the system for generically statting up NPCs and such, with a clearly defined scale that you can use to compare to your system of choice. If you're not a map-guy, and I'm not, ready made maps are even better.
WHAT DOESN'T WORK: There are a lot of "see page. XXX" placeholders in the version I reviewed, and if you're fairly new to your system of choice, this is going to of limited usefulness to you, as the appropriate scaling may not be readily apparent.
CONCLUSION: Perfect for a GM that knows their system well but doesn't want to put the time in to detail every last aspect of a prison for their setting. I can't call it a must-buy because a) most existing settings already include a super prison and b) it certainly isn't the most helpful for beginning GMs, but it is still a very well-done product.