Swept Under

This 2015 film is Canadian and also called "Maid for Murder."

The movie stars Devin Kelley, Aaron Ashmore and Stephen Bogaert. Morgan Sher (Devin Kelley) is a crime scene cleaner. On a job, she finds evidence that the police left behind which may help find the murderer. She works with a brand new detective, Nick (Aaron Ashmore), who has been assigned to the case.

The murder that took place where Morgan cleaned was done by a serial killer, and there is a strange ritual that takes place before the person kills.

It takes Nick a long while to find a clue that can help him.

Very good film but a poor ending that absolutely would not have happened. The story was intriguing nonetheless, part mystery, part a little horror.