The Tess Gerritsen-written, Midcoast Maine-made horror movie “Island Zero” is enjoying a big-screen tour before its May 15 video-on-demand release debut. The thriller will open Friday, May 4, for a week at the downtown Colonial Theatre, 163 High St.

Show times are: Friday, May 4, 5:30 and 7:45 p.m.; Saturday, May 5, 2, 5:30 and 8:05 p.m.; Sunday, May 6, 2, 4:45 and 7 p.m.; Wednesday, May 9, 4:45 and 7 p.m.; and Thursday, May 10, 4:45 and 7 p.m.

Best-selling author Gerritsen, who lives in Camden, will introduce the latter two shows Saturday, and do a Q&A after the 5:30 p.m. one. Her son, Lincolnville’s Josh Gerritsen, directed the film; and his former Camden middle school classmate Mariah Klapatch produced. Many a Midcoast face and location is featured in the old-school suspense thriller that harkens back to the days of drive-in scares driven by environmental fears such as 1954's “Them!”

While much of the filming was done on Islesboro, scenes also were shot in Camden, Lincolnville, Rockport, Duck Trap and Monhegan. Principals with local roots include professional actor Matthew Wilkas, a Camden native; and Elaine Landry, a current Camden Hills Regional High School student; and there were many local extras. Belfast’s Elaine Bielenberg costumed them all.

The Donkey Universe Films movie had its New England premiere at the 2017 Boston International Film Festival. Its storyline is classic: the ferry just stops coming to a small fishing island off the coast of Maine. Phone connections disappear, and so do the boats headed out to the mainland (actually, the boats survive). Blood is spilled, secrets are revealed and it all comes down to a hardy group of survivors versus … well, viewers will have to see for themselves.

Tickets are the Colonial’s usual: $9/$8 for 65+/$6 younger than 13 for evening shows; and $6 all seats for matinees and Bargain Wednesdays. For more information on the movie, visit islandzeromovie.com.