By Clark Collis
Updated October 28, 2016 at 01:01 AM EDT

In the new horror-thriller Pet, Dominic Monaghan plays an animal shelter worker named Seth who develops a worrying obsession with an old high school acquaintance, Holly (Ksenia Solo). How worrying? Well, let’s just say Seth sets about building a cage large enough to fit, say, an old high school acquaintance.

Directed by Carles Torrens and written by Jeremy Slater — whose credits include Fox’s The Exorcist series — Pet opens in theaters and on demand, Dec. 2.

You can see the trailer for Pet below and an exclusive clip, above.