
Art by John Coleman Burroughs.
Deep in the heart of Africa rises a mighty cone-shaped mountain, an extinct volcano, in the huge crater of which lies "The Forbidden City of Ashair" where Atka, the cruel queen, rules: and Brulor, the false god, holds forth in his mysterious temple at the bottom of a great lake of crystal clearness.
To reach this inaccessible stronghold two safaris endure hardships and perils that bring death to some and high adventure to all. Love and hate and jealousy and intrigue play their parts in a battle of wits and endurance where courage and loyalty contend with duplicity, cruelty, superstition, and savagery.
One safari is bent on the rescue of the son of its leader from the clutches of Atka and the false god; the other, headed by a wily and unscrupulous oriental, seeks only The Father of Diamonds guarded by Brulor and his priests and Atka and her plumed warriors. There are hand-to-hand encounters with terrifying marine monsters among the wrecks of ancient galleys at the bottom of the great lake that spreads across the floor of the crater of Tuen-Baka.