Agatha Christie's 'Murder on the Orient Express' is a classic mystery. The plot is full of twists and turns as detective Hercule Poirot tries to solve a murder on a train where every passenger seems to have a secret.
One interesting story could be 'The Case of the Vanishing Heirloom'. It might involve a family heirloom that suddenly disappears, and the detective has to follow a trail of cryptic clues left behind.
One interesting story could be 'The Haunted Mansion' in it. It's about a family who moves into an old mansion and strange things start to happen. They hear unexplained noises at night and objects move on their own.
One interesting kids mystery story is 'The Secret of the Old Clock' by Carolyn Keene. It follows Nancy Drew as she solves the mystery of a missing will. Another is 'The Boxcar Children' series. The four orphaned children live in an abandoned boxcar and solve various mysteries in their new town. And 'Encyclopedia Brown' is also great. Leroy Brown, known as Encyclopedia, solves cases using his vast knowledge.
Well, there's the 'Midnight School Tour Mystery'. In this story, a group of students sneaks into the school at midnight for a dare. They experience strange occurrences like doors opening and closing on their own, lights flickering. Eventually, they discover it was the school janitor playing a prank on them to teach them a lesson not to break the rules. Then there's the 'The Case of the Missing Homework'. All the students' homework in one class vanished overnight. It was later revealed that a mischievous pet dog got into the classroom and scattered all the papers around the schoolyard.
One great kid mystery story is 'The Secret of the Old Clock' by Carolyn Keene. It follows Nancy Drew as she tries to solve the mystery behind an old clock. Another is 'The Boxcar Children' series. The children in the story are orphans who solve various mysteries while living in an abandoned boxcar. And 'Encyclopedia Brown' is also very popular. Leroy Brown, nicknamed Encyclopedia, uses his vast knowledge to solve the mysteries in his neighborhood.
The Cicada 3301 mystery is also quite well - known. It started as a series of complex online puzzles. They were highly encrypted and involved elements of cryptography, steganography, and other esoteric knowledge. People all over the world tried to solve these puzzles, but to this day, the true nature and purpose of Cicada 3301 remain a mystery.
One interesting mystery kids story is 'The Secret of the Old Attic'. In this story, a group of kids discovers a hidden diary in the attic that leads them on a journey to solve a decades - old mystery about a missing family heirloom. Another is 'The Mysterious Footprints'. Kids find strange footprints in their backyard that seem to belong to no known animal, and they embark on an adventure to figure out what made them. And then there's 'The Haunted Schoolyard', where kids at school experience spooky happenings and they have to find out the truth behind the hauntings.
One interesting story might be about a missing heirloom. A young detective in the neighborhood tries to solve the mystery of where the precious family heirloom has gone. It could involve interviewing neighbors and following clues around the town.
One interesting mystery story is about a lost treasure in an old mansion. A group of kids discover a map in their attic which leads them on an adventure to find the hidden gold.
Perhaps a story in which a locked room mystery occurs. A wealthy man is found dead in his study with the door locked from the inside. The police are baffled. However, a young detective notices a small air vent and realizes that a very thin person could have slithered through it. He then uncovers that the victim's nephew, who was a contortionist, was the culprit.