The Adventure of the Red Circle (Arthur Conan Doyle)

 

Spoiler review

I like the story, and I don't feel that it ends abruptly because we don't need to resolve everything. But I do have some nitpicking.

The couple was aware of their dire situation, so let's imagine this. Was it necessary for the husband to signal Beware three times? Anyone would be suspicious to see that, no?
ATTENTA three times! 1 20 20 5 15 20 1 times three. In total, someone could see 246 flashings without the message going anywhere! Other people are living opposite, and I don't ev...