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Welcome to the true crime vault, home to 2020's most chilling stories.

This is a story of two brothers, one hero and the other, a monster.

Oh, my brother.

A serial killer in a national park is a story.

But there was more to this story because you had a serial killer whose brother had been a national celebrity.

Seven long years ago, a youngster in California vanished.

Today he showed up with another boy.

Five-year-old Timothy White.

He literally said, I was not going to let that child go through what I had already been through.

Books, television, movies, it was absolutely incredible.

The moment that Steven Stainer is abducted is the moment that this story really begins.

There's going to be a homecoming.

You would imagine sheer joy that the entire family would be ecstatic.

But one member is not so thrilled.

He was cold, hateful.

A vicious, vicious killer.

But he's even more twisted than that.

We have recovered two bodies.

You could never imagine something so heinous happening in and around Yosemite.

I mean, this is a story that decades later they're still talking about.

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