Charles Knight

The life of Spartacus, the gladiator who led a rebellion against the Romans.

When the fabled Star of Rhodesia diamond is stolen on a London to Edinburgh train and the son of its owner is murdered, Sherlock Holmes must discover which of his suspicious fellow passengers is responsible.

Foreign agents are smuggling monium (a chemical used in producing poison gas) into Mexico. The three Mesquiteers get involved when they ride to save a girl (really a government agent) on a runaway horse.