The Shoe Cum Killer

Casey receives a call from a (bad) cop about a new lead in a case she is working on which will lead her to an abandoned warehouse. When she arrives she meets up with the cop who explains the situation. They both go inside the warehouse and have a look around. As Casey walks into a room full of mannequins the cop slows down and trails off into the background with an evil grin on his/her face. It is a setup. Casey realizes she is alone and calls out for the cop but gets no response. She continues to investigate...