Sosie Bacon Is Marked for Death in 'Smile' Trailer

Who knew the simple act of smiling could send shivers up a viewer's spine? 

But the trailer for Parker Finn's forthcoming feature film debut Smile might just do that to you. Watch it below.

The film, which is based on his short titled Laura Hasn't Slept, follows Dr. Rose Cotter (Sosie Bacon) as she starts experiencing frightening, unexplained occurrences after she witnesses a traumatic incident with one of her patients (played by Caitlin Stasey). 

"I'm seeing something no one else can see," this patient tells Rose in the trailer. "It's smiling at me."

The patient sees it during a session with Rose, which leads her to scream and slide backwards in fear, but as Rose goes to call for additional help, there is quiet and eerie calm. The patient stands before her, now the one smiling, but with a shard of a broken flowerpot in her hand, and dies by suicide (which the trailer does not show, instead relaying via dialogue from another character. Presumably, though, the film will show the act in full).

Rose then begins to investigate what happened and begins to see others wearing the same eerie smile, seemingly in a trance, warning (or perhaps threatening, depending on your perspective) her that she is going to die. 

But maybe she doesn't have to, as she finds one man (played by Rob Morgan) who claims to have survived such a phenomenon. In order to escape her new horrifying reality, Rose has to confront her troubling past. 

Finn wrote and directed the film, which also stars Jessie T. Usher, Kyle Gallner, and Robin Weigert, with Kal Penn. It is produced by Marty Bowen, Wyck Godfrey, Isaac Klausner, and Robert Salerno and hails from Paramount Pictures in association with Temple Hill Productions.

Smile is due in theaters on Sept. 30.