One World by Night (colloquially OWbN, pronounced "Obi-Wan") is a global organization of players, storytellers and coordinators of the White Wolf live-action roleplay series -- in particular, Vampire: the Masquerade, Werewolf: the Apocalypse, Mage: the Ascension, and others of the "Old World of Darkness."
OWbN is comprised of many Chronicles -- individual games, usually within a city and usually on a regular schedule, that have their own individual, relatively minor (yet no less engaging) plots. Characters within Chronicles may move freely about other Chronicles within the organization, allowing an incredibly immersive experience within the fictional universe -- as well as the possibility of inter-Chronicle "crossovers." As mentioned before, each Chronicle has their own plots, set of house rules, and overall atmosphere and flavor, allowing for a distinct experience at each game which is still consistent with the world at large, as it were.
If you'd like to join in, feel free to check for your city on this
map of Chronicles. If your city isn't on the map or in the list yet, don't worry; more Chronicles are joining and being added frequently, so you may see it at a later date. Alternatively, you could ask around or look around on websites such as Craigslist if you're just looking for (as an example) a local game of Vampire -- remember, the map only includes Chronicles within the organization, not every Chronicle that may exist.
This website also has information on character regulations, OWbN bylaws, rules that are held to in every Chronicle, and more. However, if you still have questions or comments, you can always e-mail us at owbnwebteam (at) gmail (dot) com.
Thanks for visiting and we hope to see you again soon!