Book 3

Ebenezer Gryce is thinking about quitting detective work, but a curious case delays his retirement. It's the murder of a wealthy old man in a locked room, a circular study with lights that change colours and walls that move. There's a also a talking parrot who keeps saying "Remember Evelyn," and a servant who doesn't talk at all but is clearly a bubble off. What can it all mean? A clue leads Gryce to Miss Butterworth, who is only too willing to help the investigation.