pushed her off the roof after first standing on the edge and pretending to be her. She wore a similar Karen Millen dress and at that distance no one could see her face. Then she pushed your wifeâs body off. But you were in Miss Yuâs apartment earlier. And that is where you killed your wife. You drowned her in the bath.â
âSheer fantasy,â said Mr. Wong.
âIâm afraid we have Miss Yu in custody already, and she has told us everything.â
Mr. Wongâs shoulders slumped. His legs started to shake and he sat down heavily. âIt was an accident,â he said. âI didnât mean to kill her.â
âYour wife found out that you were having an affair?â said Inspector Zhang.
âShe must have done. She must have found the key and copied it, and then followed me to the apartment.â
âAnd she used the key to let herself in?â
Wong nodded. âShirley and I were in the bath. Together. Celia burst in with a knife.â
âShe was angry?â
Wong laughed sharply. âShe was like a woman possessed. Iâd never seen her so angry. She came at Shirley with the knife, trying to stab her. I tried to take the knife from her and she cut me.â He held up his hand. âThe blood just seemed to make her crazier. She kept trying to stab me, saying that Iâd ruined her life and that she was going to kill me.â
âSo you pushed her under the water?â
Wong shook his head. âI didnât mean to kill her, but it was the only way I could stop her. She fell into the bath and I knelt on her and tried to pull the knife away but she kept struggling. Then suddenly she went still.â
âAnd Miss Yu, what was she doing while this was going on?â
âShe was hysterical,â said Wong. She was sitting on the floor, crying and shaking. It wasnât her fault, Inspector. Shirley didnât do anything wrong.â
âShe covered up a murder, Mr. Wong,â said Inspector Zhang quietly.
âWe had no choice,â said Mr. Wong.
âAnd the key? The key that your wife used to let herself into the apartment. You took it?â
âShe must have been planning it for ages because she had made a copy of the key I used. And last night I couldnât find my keycard to get into the building. Celia had taken it. She followed me to the building and then used the keycard to get in and the key to get into the apartment.â
âAnd after she was dead, you took the key and the keycard?â
âI knew that if you found them you would find the apartment,â said Mr. Wong. âI didnât mean to kill her, Inspector Zhang.â
âBut you did,â said Sergeant Lee.
âIt was an accident,â said Mr. Wong.
âBut throwing her off the building wasnât,â said Inspector Zhang. âThat was quite deliberate.â
âI had to give myself an alibi,â said Mr. Wong. He put his head in his hands. âI didnât want to do it, and neither did Shirley. But we knew that if my wifeâs body was found then Iâd be the obvious suspect.â He looked up at the inspector. âItâs true, isnât it? Most murders are committed by family members?â
âOr work colleagues. Or neighbours. Yes, that is true. It is very rare for someone to be killed by a stranger.â
âThat was what I told Shirley. If you found my wife and I didnât have an alibi then I would be the obvious suspect. But if she died when I was in my apartment, then I would be in the clear.â
âYour mistress and your wife are not dissimilar in appearance, which enabled the deception,â said the inspector.
Mr. Wong nodded. âThat was what gave me the idea,â he said. âWe removed the clothes she was wearing and then we dried her hair and redressed her in one of Shirleyâs dresses. Shirley changed into a similar dress and then we carried my wife to the roof. Then