itibarenJurura, Uribia, La Guajira, Kolombiya
This is still one of Agatha Christie's finest novel about Poirot. The mystery was revealed by Hasting after Poirot's death through Poirot's letter written upon his deathbed.
this book is extremely dense, but so interesting (for someone who is interested in this sort of stuff). i especially liked chapter 2, "the phantom state," which talks about the underground government, schools, and health care systems that were set up.