Over the past few years, multiple people have died in Thailand from what appears to be exposure to some kind of poison. Most of these people have been tourists. And most of them have been young women. The deaths have happened in clusters. Five or so on the island vacation hotspot of Kho Phi Phi. Another group of six at Chiang Mai's Downtown Inn.

Lots of possible explanations have been suggested — ranging from serial killers, to hallucinogenic beach drinks, to overuse of banned insecticides in hotel rooms. But, so far, none of the specific poisons proposed as the culprit totally makes sense in relation to the deaths. And, to make things worse, it seems like Thai authorities are doing their best to make it difficult to actually investigate what has happened in individual cases, and figure out whether the cases are linked or not. At this point, it's hard to even know whether all the people who have died exhibited the same symptoms.

Deborah Blum, a Pulitzer-winning journalist who has done a lot of reporting on poisons and true crime has been following this story and just published another piece on the still-unfolding mess.

Your daughter died.

Your daughter died thousands of miles from home. In a hotel where no one came to help. In a hospital where she struggled to keep breathing and just couldn’t. In a room where her heart – and somehow you still don’t really believe this – just stuttered to a stop. In a country, where authorities have failed for months, years even, to tell you how or why your daughter died.

Your daughter, you’ve come to realize, died in a pattern that links too many other young women, a chain of suspected poisonings over the last few years. Jill St. Onge, 27, of Seattle, Washington, and Julie Bergheim, 22, of Drammen, Norway, who both died in May 2009 on the southern island of Koh Phi Phi. Sherifa Khalid, 24, of Kuwait, who died 12 hours she spent a day on the same island in July of the same year.

Read the rest of the story at Deborah Blum's blog, Elemental

Check out two previous stories that she's written on the same subject.