Best-selling Camden author Tess Gerritsen is springing onto the big screen with a low-budget horror film based on a Maine island.

“Island Zero” will be screened Saturday at the Emerge Film Festival in Lewiston/Auburn.

The movie is about what happens to residents of a Maine island when the ferry stops coming. Much of the filming took place in March 2016 in Camden, Rockport and Islesboro with a mostly Maine crew.

Gerritsen is the author of more than two dozen suspense and medical thrillers. The movie is a family project with Gerritsen writing the screenplay and her son, photographer Josh Gerritsen, serving as director. It debuted earlier this month in Boston.

The film will be shown at 4 p.m. at the Community Little Theater in Auburn.