Indiana Jones and the Ape Slaves of Howling Island is the sixteenth gamebook in Ballantine's Find Your Fate Adventure series, and the fourth and final book in the series written by R.L. Stine. It was first published in December 1986.
Off the coast of Eastern China, archaeologist Billie Simpson is leading a dig for Malaysian artifacts on Howling Island when her expedition is raided by a crazed scientist who threatens to kill them all. Barely escaping with her life, Billie now desperately wants to return to the island to find her brother.
A foul wind blows off Howling Island—and an eerie sound, too. Nobody knows where the bone-chilling noise is coming from. Yet there are much graver concerns: shocking double crosses, vicious attack dogs, a nation of brainwashed six-hundred-pound gorillas, and one dangerous, demonic man with wicked ideas for some very hideous experiments....