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.

Three junior detectives solve a mystery involving a collection of antique busts, a legacy, a strange letter, and a red ruby.

"The luxurious Blue Train carries its passengers across France, from dreary wintertime England to the sunny French Riviera. When it arrives at Nice, a guard attempts to wake serene Ruth Kettering from her slumber. But she will never wake again -- she has been killed, and a heavy blow has disfigured her features almost beyond recognition. What is more, her precious rubies are missing and her ever-present maid was dismissed from the train back in Paris....

Like her idol Sherlock Holmes, eighth-grader Ingrid Levin-Hill uses her intellect to solve a murder case in her hometown of Echo Falls.

"It's one challenge after another for 10-year-old John Avery Whittaker! He tinkers with electronics, takes on the lead in the school Christmas play, and comes up against a new bully, all while continuing to investigate the mysterious properties of the cloth from his grandfather's trunk - if he can find it! It's missing! Meanwhile, strangers have come to Provenance and they're askings lots of suspicious questions about the Confederate gold Johnny and...

As she fights for the family company, Tandy Angel's detective prowess is called into question and her paranoia builds, forcing her to face the possibility that her stalker could be all in her head--or the very real danger that will finally bring her down.