*Out of concern for your good friend Dr Harriet Jekyll, you knock on her door. You're concerned that she's being blackmailed, after a cheque with her name on it was cashed by a mysterious criminal known as Mrs Hyde.* *You stand in front of the large home, surely an expensive one given London's prices. The front door opens slowly. It's Jekyll.* "Oh, hello! Do come in!" *she says, with an undertone of discomfort.*