Discover the real reasons we lock our doors at night by reading these tales of true crime and horror.

Have you heard the story of the experienced hiker who came across a cave with an M-shaped entrance and posted his findings on YouTube, only to have someone comment that he shouldn't go in there because he would never be seen again if he did?

What about the horrifying story of a serial killer from South Korea who ate the livers of some of his victims?

Or the enduring mystery of the rambunctious 5-year-old little boy from Illinois who was checked out of school by his mother, to never be seen again, even after his mom's body was found in a Rockford hotel?

If you want to uncover the details behind these unsolved cases and many others, you have come to the right place.

As the old saying goes, truth is stranger than fiction, and nowhere is this more true than in the bone-chilling, unsolved accounts included in this collection.

It is estimated that in the United States alone, there are 25 to 50 serial killers loose at any given time.

Even more shocking is that 1 in every 3 murders in the United States goes unsolved each year.

With statistics like these, who needs made-up plots of fictional characters when there are so many real-life monsters lurking in the shadows?

In this collection of unsolved cases, you will discover:

• 15 bone-chilling true stories that will frighten you more than any Hollywood movie ever could
• An account of the first recorded serial killer in America who used his hotel (later dubbed "Murder Castle") complete with trapdoors and secret rooms to torture and kill many of his suspected 200 victims
• Multiple accounts of harrowing exorcisms, including that of a possessed mother whose children were also said to have been inflicted after hospital workers witnessed the 7 year old walk backward up a wall and onto the ceiling
• A terrifying story that will convince you to never pick up a ouija board ever again
• The disturbing account of how the "Phantom Whistler" terrorized one young woman in Louisiana
• Numerous retellings of haunted houses disturbing the lives of their inhabitants
• The discovery of a young woman's body in the water tank of Hotel Cecil - the building that was the inspiration for American Horror Story's season called simply "Hotel"
• The "Phone Stalker" who knew one household's every move, despite all their efforts, even calling and telling the woman "I prefer lemons" when she was cutting up oranges
• The true story of a young German girl that inspired the movie The Exorcism of Emily Rose

And so much more.

As children, we are taught that the boogeyman isn't real and scary movies are fictional, fantastical stories.

However, the horror is that the stories of these boogeymen are based on real accounts of terror, many of them still unsolved to this day.

If you want to read true, terrifying stories that will have you questioning your sanity and sleeping with the lights on