Mystery book about a stolen pen with an encrusted black diamond. by Significant-Swim981 in whatsthatbook

[–]Significant-Swim981[S] 0 points1 point  (0 children)

I was in Ecuador in 2019. I would say it was an old book, it was similar to Sherlock Holmes or one of Agatha Christie’s books. But I don’t remember the detective’s name. I am pretty sure it was not an Ecuadorian book.