We asked around. Ollie, a young British resident of Phi Phi, said he had seen into the room where the young women died. His room at a nearby resort overlooks the Palms Residence Phi Phi, where the women died in a ground-floor room.
A law student, he said he watched with some alarm as the bodies - which he said were garishly akimbo when he first saw them - were taken away and the room spotlessly cleaned.
Whether toxicology samples were taken beforehand won't be known by Phuketwan or the public until later. But we did see police leaving the Palms Residence Phi Phi today with a clear plastic bag of items.
These appeared to include a headphone set, some pills and medication, and some other material that wasn't plain to us.
We were told that as well as talking to staff at the resort today, the police also interviewed a local doctor who was the first medical person on the scene.
The bodies did not go to the Phi Phi Hospital. They were taken straight off the island to mainland Thailand, where they were in Krabi Hospital today but likely to be sent for autopsy soon to facilities in Bangkok or another province, Songkhla.
We were a little surprised to see police still at the resort in such numbers today. With this case an important one, we figured Saturday should have seen the resort swarming with police.
But Phi Phi, popular holiday destination with 20-somethings from around the world, is difficult to reach, a little remote. Hence its charm. It is remote in many senses, particularly smell.
Strolling around Phi Phi's narrow lanes, where there are no motorised vehicles, only walkers and cyclists, the stink of bad water or odd chemicals assault the nostrils at some points, while pleasant restaurant smells waft out at others.
People over the age of 30 may feel out of place here. While there were a few families and even a person or two over 40 on the ferry from Phuket today, the vast majority of people on Phi Phi are aged 30 or younger.
The poet John Milton wrote about ''Paradise Lost'' and the concept of a heavenly tropical haven seems to drive brochure writers to hyerbolic extremes.
But after the best part of a day on Phi Phi, our conclusion was that it's Paradise Stung.
A large number of the young people we encountered seemed to be suffering from hangovers of one kind or another. It's certainly true that Phi Phi is, as TripAdvisor suggests, possibly deserving of the title of World's No 1 Must-See Island.
The ragged cliffs and sandy bays are incomparable. However, there is, as Milton could probably tell you, also a dark side. It's toxic in places. Black water oozes along some pavements.
The odor of sewage on the loose is not hard to find. This week the island is probably still suffering the aftermath of a monsoon downpour that swamped the entire region a little while back, a deluge on a scale seldom experienced.
Would Phi Phi's bad water and sewage disposal system have stood up to such an unusual torrent? We think not.
There's always the chance that Phi Phi's lack of proper infrastructure had something to do with the deaths of the Canadians. Add it to the theories.
Back in 2009, when a couple of other young women took sick on Phi Phi and died in mysterious circumstances, all the theories about chemicals, gasses and food poisoning were suggested.
No answers were ever found. Police in Thailand failed to determine what killed American Jill St Onge, 27, and Norwegian Julie Bergheim, 22, on Phi Phi.
Where they were staying, at Laleena guesthouse, was a little closer to Phi Phi's black sludge of bad water than the Palm Residence Phi Phi. But the heavy rains could have carried the muck a lot further this time.
It was, remember, the same time of the year.
Jill St Onge was cremated before her remains were sent home. Julie Bergheim's body was returned to Norway intact, and some of the best pathologists in the country attempted to determine the cause of her death. They failed.
It is to be hoped the Canadian authorities charged with investigating this case, along with the Thai police, are aware of the need for a result and consider the option of flying the sisters' bodies back to Canada for a thorough second autopsy, should a cause of death not emerge soon.
Paradise Regained is what we'd all like to see.
Give us not only an end to the black water in the laneways but also a conclusion to not knowing what killed two more vibrant young women on Phi Phi.