NEW YORK CITY (KUTV) — In a four-part TikTok saga, a woman discovered a hidden apartment behind her New York City bathroom mirror. 

The video quadrilogy originates with Samantha Hartsoe noticing her cold apartment had a distinct draft that she eventually tracked to her bathroom mirror. 

"You can see my hair blowing in the cold wind. The air is coming from the mirror. I realize the mirror moves; let me show you what I found," she says at the very end of the first episode, creating a cliffhanger.

The mystery deepens when she realizes, "There is a room back there." 

And she has to go in.

Considering if her hips will fit through the opening behind the mirror, Hartsoe takes the journey to the other side, protected only with a breathing mask and a hammer.

"Mean it when you swing it," a roommate advises. 

She navigates the hole with an improvised headlamp and discovers not only a room — but in something of an urban Indiana Jones adventure — a whole hidden, empty, New York City apartment.  It also doesn't seem terribly different than films like "People Under Stairs," that with just a little imagination can provide a whole vibe of creepy fear. But Hartsoe didn't stop with knowing where the cold air was coming from, she needed to do some exploring and lived to post it on TikTok.

"Made it out alive," she said. 

As the video series, shows, Hartsoe came to no harm in the production of the viral videos that collected millions of views and she got to see and explore an empty apartment with drafty rooms, stairs and a spare, uninstalled toilet. 

As of Friday, each of the four episodes has fewer views than the previous one, with Part 1 edging toward 10 million views. Her previous videos on TikTok counted views in the tens or hundreds of thousands. She cracks jokes and dances.