mystery and detective stories

In the late 1880's two determined sisters interrupt their theatrical career to uncover a murder plot against their grandfather.

Harriet does not like the new house but intriguing questions about a nearby mountain make her forget her complaints.

Fifteen-year-old Bob stumbles across some old secrets involving his family and a forty-year-old murder.

Miss Pickerell is joined by her nephew and a team of his classmates as she tries to discover what is causing the mysterious attack on the western side of Square Toe Mountain.

A young boy and a ropemaker try to unravel the mystery connecting a scientific expedition, a mining operation, and an ancient Indian tribe.

Two friends search for the secret of an old house rumored to have been a station on the Underground Railroad. Then one of them disappears.

An eleven-year-old decides to find the reason for the threatening letters and phone calls her great-aunt has been receiving.

Teen-age David and his sister search southwestern Colorado for the mysterious animal that is killing the ranchers' livestock.

While staying with her grandparents in the Poconos, a young girl becomes involved in the mysterious events taking place in the nearby home of a famous movie actress.

Doris Fein and her new friend, who is a contender for the world's race car driving championship, employ their wits and driving skills against a group of ruthless revolutionaries.