The guitar appraiser had just left when the cleaner arrived. Chen Shi washed a cup and poured a cup of tea for her as he asked her to sit down. "Have you heard about how the house owner was murdered?”

"I heard that from the police in the morning when they came to find me for questioning."

"Sorry, I have to ask again. How many days do you come over every week and what do you normally do?"

“Every day. I help clean and buy things once in a while.”

"Do you have a key on you?"

"I have one but not for that room." The worker pointed to the study. "The room seemed to have some valuable things. The owner refused to let me go in. I just come over and clean every day, then leave. I usually stay for three hours. Most of the time, he’s either not here or sleeping.”

"Have you given the key to other people?"

The house cleaner got roused...