Bisexual actress (and Eagles fan) Hannah Einbinder is mesmerizing in trans and nonbinary writer/director Jane Schoenbrun’s new film, “Teenage Sex and Death at Camp Miasma” opening Aug. 14 at area theaters. “Teenage Sex and Death at Camp Miasma” pivots on Kris becoming sexually involved with Billy and blurring the lines between the horror film fiction and reality. Folks who know you from “Hacks” may be surprised to see you in a horror film. So, I didn’t approach it necessarily just as a horror film. From left, Gillian Anderson and Hannah Einbinder stars in ‘Teenage Sex and Death at Camp Miasma.’