Suspense - Once a Murderer

Tom Shaw and Bert Shinn were employed by an Advertisement Signage company and were doing some work in an empty shop located at 75 Bond Street. The owner had recently contracted the signage company to help prepare it for reopening. While Tom was working, a man approached him and asked for the key to the shop, saying that he was the new tenant. Tom gave him the key and told him that he and Bert would return in the morning to retrieve their ladder and tools. The next morning, as they are going to the shop, Bert asks "What did you give him the key for?" Tom says "He said he had leased the place. How was I to know?" Bert says "It doesn't look like he's moved in, anyhow. I thought you said he'd be here". They find the door to the shop open and go inside. Tom says "I'll take the ladder. The tools are in the box in the corner". As Bert retrieves them, he sees something behind the counter. He says "It looks like a shoe". As Tom walks over to see, Bert says "It's murder, Tom! It's a murder! Look Tom!" Tom says "You stay here, and I'll call the police!" Bert says "Look at her poor face!" Tom asks "Are you alright, Bert?" He says "I don't know. I think I'm going to be sick ..." Tom says "You wait outside, and I'll get a copper!" Later that day, Tom was interviewed by an investigator at the police station. While there, he learned the name of the victim, Anna Leeming. Tom recounted the story of how he gave the key to the new tenant. The inspector asks "Did the stranger stay in the shop after you had gone?" Tom says "Yeah. He said he wanted to look around and to not worry about the tools, because he would lock up when he left". The inspector asks "Didn't you wonder how you would manage to get in this morning if the door was locked and you no longer had the key?" Tom says "No, he said he'd be there early and let me in". Inspector asks "And you've never seen Anna Leeming before?" Tom says "Never". Inspector says "You've been very helpful, Mr. Shaw. We may wish to get in touch with you again, particularly when we find the man who leased the shop".