Trapped

You are detectives in charge of investigating an incident whereby a lift in a commercial building malfunctioned resulting in two casualties. Up until now, the case had little progress due to lack of evidence and a previous detective team had classified the incident as a human error accident. Recently, the Criminal Investigation Department received an anonymous message, which claims that a crucial piece of evidence was left in the building. Now, you and your team are heading to the crime scene for further investigation.