Publisher: 8

The Reward of Nostradamus

Henry Bedford-Jones

The Richest Widow

Hulbert Footner

The Riddle of the Frozen Flame

Thomas W. Hanshew

The Riddle of the Mysterious Light

Thomas W. Hanshew

The Riddle of the Night

Thomas W. Hanshew

The Riddle of the Purple Emperor

Thomas W. Hanshew

The Riddle of the Rail

Fred M. White

The Riddle of the Sands - With Audio Level 5 Oxford Bookworms Library

Childers, Erskine