From K-QED.

The nights are getting longer.

There's a chill in the air.

And soon,

ghoulish trick-or-treaters will be knocking at your door.

Today on Bay Curious, we've got a treat for you.

A spooky special inspired by this question from a listener.

Hi, I'm Kelsey Poole and my question is what are the most haunted places in

San Francisco? We sent Kelsey on a San Francisco ghost tour to learn the haunted side of the city's history.

It's a cool way to see the city and you get some spooky stories to keep you up at night.

But what we didn't expect to find on the tour was the real life story that would shake us the most.

Something not found in many San Francisco history books, something more significant than any Halloween legend.

I'm Olivia Alan Price. This is Bay curious. Today, the story of a crusading heroine who somehow became a demon in her own lifetime

Support for Bicurious is brought to you by Sierra Nevada Brewing Company, still family owned, operated, and argued over.

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Visit Sierra Nevada.com to find your new favorite beer today.

Bakurious reporter Carly Severn went along with the question-asker, Kelsey, on the ghost tour and brings us the tale.

All ghost hunters, gather around, gather around. The San Francisco ghost hunt starts at dusk in the city's Pacific Heights

neighborhood in the shadow of those looming Victorians.

Hello and welcome to the San Francisco ghost hunt walking tour.

Actor Christian Kajigal leads us around the steep streets in full 19th century dress, top hat and clacking cane.

Every corner brings another ghoulish story from San Francisco history,

...