Cold City is an excellent story game that can support both one shots and campaigns.

The v.1.1 version contains all of the material from the original version, and adds in some richer rules for task resolution, and combat. If you like games that thrive on inter-party conflict then Cold City is a good buy. If you don't like that sort of thing, and you prefer a more reactive style of play, then Cold City may not be for you.

The PDF itself is good and fully bookmarked.