mystery and detective stories

After Eric moves away he sends cryptic notes to Sebastian and David, who attempt to make sense of them by investigating a mysterious death.

Young sleuth Sebastian and three friends probe the mystery of a poisoning in their school cafeteria.

While searching in Iceland for a missing sailor sought by an insurance company, the teen-age detective brothers uncover a plot threatening the life of a United States astronaut and the secrets of NASA's moon project.

When the twins are at a summer camp, children's articles are stolen and are mysteriously placed under Ashley's bed.

In 1928, when her father tears her and her brother from their mother in North Carolina and takes them to live with aunts in Harlem, twelve-year-old Bessie is trapped in a strange place, especially after her father mysteriously disappears.

In 1918, caring for her family's homing pigeons while her father is away fighting in World War I, twelve-year-old Pam comes to suspect that a mysterious stranger in her small North Carolina town is a German spy.

In their Pennsylvania town in 1942 twelve-year-old Charlotte and her classmates collect scrap metal for the war effort only to have it disappear from the school basement.

The twins investigate when their dog Clue is framed for the disappearance of Fiona O'Leary's cat.

The twins investigate the mysterious events that seem to prove that there is a monster at the Ski Mountain resort where they are vacationing.

The twins investigate attempts to sabotage the rock band in which they are playing.