This was a $4 book I downloaded on my Kindle. I remembered watching Edgar Wallace movies in Germany back in the 70s where they are very popular. To be honest, I didn't really expect much, but was pleasantly surprised.
The book seems to be set at around the turn of the century in London and Hertfordshire. A young lady working as a chashier for a rich spoilt heir turns down his advances and loses her job over it. The heir is taking the rejection very badly and swears revenge. He tries to frame her for theft but is stopped by his cousin, a sleuth who has returned from an extended sojourn in China. He is accompanied by his trusted Chinese sidekick, and both men are famous in China for hunting down dangerous criminals.. The story really starts when the heir is found murdered in a park, with daffodils on his chest. The young girl disappears and is an immediate suspect. The sleuth is falling in love with her and while chasing the murderer, also tries to exonerate the girl.
The story is fast-paced with some surprising twists, well written and great to read. One note of caution: the book was written in the 1920s and the references to China and the Chinese are interesting, to say the least. To be fair, Edgar Wallace described the English in as stereotypical way as the Chinese, and I would not let this put me off from enjoying a great period piece.
By the way, check out Edgar Wallace's life story on Wikipedia, really worth a read!