Cold Weather (2010) on Netflix

Plot summary

Doug left Chicago, where he had been studying forensic science, and now shares an apartment in Portland with his sister Gail. He takes work at an ice factory and becomes friendly with a co-worker, Carlos, who also works as a DJ. Doug's ex-girlfriend Rachel arrives in town, telling him her employer wants her at its Portland office for training. She joins the group, and the four of them spend their time together: games at Doug's apartment, dancing at one of Carlos's sets, and a Star Trek convention that Rachel attends with Carlos. Then Carlos comes to Doug's place and reports that Rachel missed his DJ set and is nowhere to be found, worrying that something has happened to her.