In my judgment, Whiteout! is the best ICONS adventure that Adamant has published thus far (as of July 18, 2012). Author John Post has covered pretty much all of the bases, giving GMs sufficient guidance to easily respond to a wide variety of PC responses to the freak blizzard conditions besetting the northern hemisphere. The first two chapters are very free-form, almost “sandbox” in the latitude given to the PCs, while the last two chapters are fairly linear, although even here the PCs could take a number of different approaches. Lots of excellent GMing advice appears throughout this adventure. In particular, the “Running an Investigative Adventure” sidebar on p. 9 ought to be required reading for any ICONS GM (especially beginners) planning to run an investigation scene. The blizzard conditions and exotic locations are used well. The primary villains are interesting and have good synergy, but some of the supporting villains don’t add much to the central plot and seem to be included just to provide a superteam with a reasonable combat challenge. GMs running for smaller groups could easily leave out Kavik, Baba Yaga (whose artwork, apparently reused from Danger in Dunsmouth, doesn’t really fit her), or both without injuring the plot. The text isn’t absolutely free from grammatical errors and inconsistencies, but they’re few enough not to annoy too much. Whiteout! offers numerous and varied in-game experiences, and it’s suitable for both beginning and experienced GMs.