Mystery

A dream vacation turns into a nightmare for twelve-year-old Lewis and his twin sister Alison when they accompany their irresponsible new neighbors on a trip to Yellowstone Park and are chased by two mysterious men.

When their parents are killed in an accident, eleven-year-old Javier and his younger brother leave their home in Puerto Rico to go live with their aunt in Northern California, where a ghost from an unsolved crime and Javi's new-found psychokinetic powers make their adjustment all the harder.

Henry, Anna, and Jose, the junior members of the Silver Jaguar Society, are on a mission in Paris to recover the Mona Lisa--but when senior members of the Society are taken hostage, it is up to Henry to rescue them while continuing to pursue the missing masterpiece.

In Portland, Oregon, between soccer games and beginning seventh grade, twelve-year-old Madison Kincaid and new classmate Jake try to track down her missing best friend, while also helping her attorney father solve a missing-persons case.

While on a journey from Chicago to San Francisco on the California Comet with his uncle, amateur sleuth Hal Beck stumbles into a mystery when the daughter of a billionaire tech entrepreneur goes missing.

The main idea of the Nancy Drew series is that of a young, intelligent, and courageous amateur detective who solves mysteries with the help of her friends. Nancy's adventures involve unraveling complex cases, often with supernatural elements or a touch of mystery, and she is portrayed as a role model for young readers due to her independence and problem-solving skills. 

cloud of shame. But the letter describes a young African American woman named Siobhan Washington. An injustice that happened decades ago. A mystery enfolding the letter writer. And the fortune that awaits the person who solves the puzzle. Grandma tried and failed. But now Candice has another chance. So with the help of Brandon Jones, the quiet boy across the street, she begins to decipher the clues in the letter.

Discovering her ability to see ghosts when a cruel act ends her father's life and forces her to move in with relatives in 1920s Pittsburgh, young Ophelia forges a helpful bond with a spirit whose own life ended suddenly and unjustly.

"When Colin finds a shoebox full of letters hidden in a stranger's attic, he knows he's supposed to throw them away. That's his summer job, getting rid of junk. But Colin wants to rescue the letters--and find out what really happened to best friends Rosemary and Toby way back in the 1970s. Meanwhile, across town, Nevaeh also finds a mysterious letter. But this one reads like a confession to a crime. And Nevaeh knows her father, the 'Junk King,' expects her to join the rest of the family in blaming a single suspect: his business rival, Colin's mom."

Eleven-year-old Millie and five other girls, snowed in at Amelia Earhart Birthplace Museum in Atchison, Kansas, are on a scavenger hunt when the lights go out and Amelia's aviator goggles go missing.