Although I liked the setting in London's Chinatown area, apart from the initial beginning I found the mystery somewhat meandering after the mysterious Mr Wu Ling checks into a hotel and then disappears. Lord Person, head of the bank calls in Poirot to find Wu Ling as he was supposed to sell a silver mine to the bank.
You have Poirot complaining that it is the bank's fault that he is overdrawn. The endless game of Monopoly between Hastings and Poirot and then the sudden discussion of the stock market which both Hastings and Miss Lemon have an interest in.
There is a lot of back and forth between a lot of potential suspects but when the reveal comes, which I liked even though some of it makes no sense, such as the actual culprit's gambling habits and stock market flirtation. Yet other clues were obvious but could easily be overlooked by the viewer.
David Renwick co-wrote this episode, he would go on to create Jonathan Creek.