Edgar Wallace, "The Square Emerald", originally published in 1926 and made in England. The plot involves a young gentleman, secretary to a notable politician, convicted wrongly of forging a check, now released after serving his term in prison, a group of rather sinister society ladies with their sinister butler Druze, who were involved in the check and other activities, and a beautiful young woman detective from Scotland Yard, also from a stylish society background. A female sleuth is one step ahead of everyone, including the reader, and generally has jolly good fun solving the case. A mysteriously complicated plot make this Edgar Wallace book great fun with the twists coming thick and fast.