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Pery Allen Car, or PI, as friends and family called him, a 44-year-old mine worker living in Altura's Florida arrived home on a hot and muggy day in June of 1988.

He checked the mailbox and found a note addressed to him. When he opened the envelope, he found a yellow post-it note with a typed message on it.

It read, you and all your so-called family have two weeks to move out or you will all die. This is no joke.

Thinking it was a prank, PI showed it to just two people, his steps on Dwayne and his friend, Minister Robert Grant. Neither of them could imagine anyone wanting to hurt the car family and told him to ignore it.

PI took their advice and forgot about the note. He had recently married Peggy Car, a 41-year-old waitress and they had combined their two households.

The two sets of children were not getting along and, frankly, his marriage after only a couple of months was in trouble. So he had plenty going on that distracted him.

He didn't think of the note again until a few months later. After his wife Peggy, his son Travis and his step-son Dwayne fell ill with the mysterious melody that was slowly and painfully killing them.

When it was discovered that the cause was a rare poison, it was too late to save Peggy. Travis was partially paralyzed for life and Dwayne would never be the same.

That yellow post-it note was no longer a joke. It was now one of the main clues that helped solve the mystery of who poisoned the cars.

Hi there, Wondry listeners. Hannah and Sruti here from TrueCram Podcast Redhanded. Your favourite podcast Redhanded. We just wanted to say how excited we are to be included in Amazon Music and Wondry's best podcasts of the year as chosen by their listeners, which is you.

So thank you so much to everyone who listened to us voted for us or the things you do for us.

Any of you out there who haven't checked out Redhanded, what are you doing? What are you waiting for? It's a weekly show where we deep dive into the most talked about cases like the Delphi murders. And also those you might never have heard of like the Nathari Child sacrifices in Delhi.

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From Wondry and Triford, I'm Candace DeLong and this is Killer Psychie.

I've spent five decades studying people's minds through my work as an FBI profiler and psychiatric nurse. I've interviewed lots of murderers including serial killers and the question of why they did it is what I get asked time and time again.

It's difficult to get a satisfying answer without diving deep into their mindsets. So that's what we're doing and I will give you my best analysis in this series of what made them do what they did.

This episode is George Tree Powell, the Mensa murderer.

October 23rd, 1988, started out as a normal day for Peggy Car. She had the early shift at the restaurant where she worked with her daughter. It wasn't until late that afternoon that she first began to feel ill.

Her fingers and toes began to tingle painfully and she became very nauseated. She then developed pain in her chest and extremities and had difficulty breathing.

By the evening, she could not speak. In fact, she couldn't even open her eyes.

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