A nearly four-month-old Internet drama in which the cryptic video musings of a fresh-faced teenager became the obsession of millions of devotees — themselves divided over the very authenticity of the videos, or who was behind them or why — appears to be in its final act.

The woman who plays Lonelygirl15 on the video-sharing site YouTube.com has been identified as Jessica Rose, a 20-ish resident of New Zealand and Los Angeles and a graduate of the New York Film Academy. And the whole project appears to be the early serialized version of what eventually will become a movie.

Matt Foremski, the 18-year-old son of Tom Foremski, a reporter for the blog Silicon Valley Watcher, was the first to disinter a trove of photographs of the familiar-looking actress, who portrayed the character named Bree in the videos. The episodes suggested Bree was the home-schooled daughter of strictly religious parents who was able to find the time to upload video blogs of her innermost thoughts.

Image The woman who plays lonelygirl15 has been identified as Jessica Rose, a twentyish graduate of the New York Film Academy. Credit... Grant Steinfeld

The discovery and the swift and subsequent revelation of other details surrounding the perpetrators of the videos and the fake fan site that accompanied it are bringing to an end one of the Internet’s more elaborately constructed mysteries. The fans’ disbelief in Lonelygirl15 was not willingly suspended, but rather teased and toyed with. Whether they will embrace the project as a new narrative form, condemn it or simply walk away remains to be seen.