The Hardy brothers embark on a freighter trip under mysterious circumstances and find themselves involved with a smuggling ring.

America's Sherlock Holmes in sneakers continues his war on crime in ten more cases, the solutions to which are found in the back of the book.

While spending Christmas break at an Arizona dude ranch, Trixie and the Bob-Whites work to solve several mysteries--a phony cowboy, disappearing staff, and puzzling cries in the night.

In the small city of Strattenburg there are many lawyers, and thirteen-year-old Theo Boone thinks he is one of them, but his inside knowledge of the justice system means trouble when a cold-blooded killer is about to go free and only Theo can stop him.

Sixth-grader Ben Pratt's life is full of changes that he does not like--his parents' separation and the plan to demolish his seaside school to build an amusement park--but when the school janitor gives him a tarnished coin with some old engravings and then dies, Ben is drawn into an effort to keep the school from being destroyed.

Answering an advertisement for an artist's assistant involves seventeen-year-old Dickory Dock in several mysteries and their ultimate solutions.

Nancy Drew must use clues in a dead man's letters to find some unpublished musical manuscripts that will save an old man and his granddaughter from financial ruin.

Left alone when Rush, Mark, and Mona go away to boarding school, Randy and Oliver are lonely and bored until a mysterious letter brings the first of many clues to a mystery that takes all winter to solve.

In this sequel to "Howliday Inn, " the Monroe family pets are again boarded at Chateau Bow-Wow, where some spooky goings-on serve as a distraction from the kennel's poor food.

Leaving only a cryptic note, Andrew and Evie's mother vanishes on their eleventh birthday. Now, almost a year later, the twins receive a mysterious package from someone named Spy X. They soon learn that the contents of the box will lead them on an incredible journey toward finding their mother - and into a world where no one's identity can be trusted. In Book #1, Andrew and Evie aren't initially sure what to make of the package that arrives at their...