“Harry Potter” thespian Evanna Lynch is starring in independent drama “Indigo Valley,” about a honeymoon trek in the Icelandic wilderness.

The project was unveiled last week at the American Film Market as a U.S.-U.K.-Icelandic co-production, with Courtney Harmstone producing. “Indigo Valley” is based on a short film by Jaclyn Bethany, who will direct and star in the film. The story follows a newlywed couple on a hiking trip as they’re unexpectedly joined by the woman’s estranged older sister, an actress recently released from rehab.

Bethany will play the older sister and Lynch will portray her newlywed sister. Jealousy, insecurity, and sexual tension run high in the desolate landscape of Iceland, highlighting the tumultuous future these three people face.

“Indigo Valley” marks the first collaboration between Bethany and Harmstone under their new banner Indigo Films, which will center on female-driven narrative content, with a focus on international markets. Matthew Helderman of Buffalo 8 is coming on board as an executive producer. Fenrir Films of Iceland is a co-producer.

Lynch starred in the final four Harry Potter movies as the ethereal Luna Lovegood, a major ally of Potter. The Irish native was cast for the part at the age of 14 after auditioning against 15,000 other actresses. She starred in the 2015 Irish drama “My Name is Emily” and the British TV movie “Danny and the Human Zoo.”

Lynch is represented by APA and Independent Talent in the U.K.