From publisher blurb:
Each Gadget Guide in the series takes a look at a particular type of devices in Mutants & Masterminds game terms, putting together the effects and modifiers from the Hero's Handbook to present different a wide variety of gadgets of that type. It also looks at specific concepts related to creating and using those devices in play. The Guide is a catalog of ready to use toys for your M&M game!
From hidden caves and arctic fortresses to urban towers and sanctums sanctorum, comic book heroes have distinctive places they call home in their costumed identities. Likewise, villains operate from hidden lairs and brooding castles, and finding and breaching a villain's headquarters can be an important part of an adventure. This Gadget Guide looks at installations of all kinds, including heroic headquarters, villainous lairs, and the many places where heroes and villains might clash in a Mutants & Masterminds series.