The Feathered Serpent is a mystery-thriller novel penned by the remarkably prolific Edgar Wallace. A number of people receive threatening cards emblazoned with the device of a feathered serpent, a device that we later find is associated with ancient Aztec religion and with a cult that still exists in Mexico and Central America.
Then, after leaving the house of millionaire philanthropist and African explorer Gregory Beale, Daphne Olroyd is followed.