When her friend Nellie is suspected of stealing Mrs. Van Sicklen's black pearls at Christmastime, Samantha helps her discover where they really went.

Phin Chase, an orphaned stable boy in Pennsylvania in the aftermath of the Civil War, must go on the run to save his life after accidentally witnessing the murder of a mine boss by a secret society of Irishmen known as the Sleepers.

In Virginia during the summer of 1776, Felicity hears that British soldiers are raiding Patriot farms and sets out to learn who is behind the attacks in order to protect her horse, Penny. Includes an informational section on this period in America's history.

In 80 A.D., ten-year-old Roman sleuth Flavia and her friends sail from Corinth to Rhodes to try to stop a mysterious man who is kidnapping children and selling them into slavery.

A ragged stranger and the prospect of losing her family's fortune lead Flavia Gemina and her friends, Jonathan, Lupus, and Nubia to a seaside villa where possible danger and treasure are close at hand.

Flavia and her friends go to Rome to celebrate the Festival of Jupiter at Senator Cornix's town house, where they befriend the young charioteer, Scopas, and quickly find themselves embroiled in a campaign to sabotage one of the rival racing factions.

Jonathan and his friends are called to Rome by the emperor in the winter of 80 A.D. to find the new Prometheus believed to have brought an epidemic to the city, but Jonathan, obsessed with reuniting his parents, makes some unwise--and life-threatening--choices.

In 1925, after witnessing the violent actions of some gangsters, twelve-year-old Emily accompanies her older sister on a trip to a luxurious hotel on the New Jersey shore but worries that the gangsters have come to the same hotel. Includes historical notes on the time period.

In late nineteenth-century London, fourteen-year-old Enola Holmes, much younger sister of detective Sherlock Holmes, turns to Florence Nightingale for help when her investigation into the disappearance of a Crimean War widow grows cold.

Ten-year-old Flavia and her friends encounter the Roman admiral Pliny before making a journey to her uncle's farm near Mt. Vesuvius, where they try to solve a riddle, reunite a family, and get out of the path of a natural disaster.