Pet

Seth (Dominic Monaghan), a severely introverted man who works at an animal control center, becomes obsessed with Holly (Ksenia Solo), a waitress and former high school classmate of his, after seeing her writing in her journal on the bus. Seth kidnaps Holly, holding her captive underneath the animal shelter where he works, and uses their interactions to manipulate her into committing gruesome murders, which he believes will "save" her from herself. As they engage in psychological mind games, Holly begins to slip details to draw Seth in, while Seth maintains that she committed the other murders out of guilt for getting away with Claire's murder.