by Hammond Innes. Knopf, $6.95. One is always entitled to expect a satisfactory mixture of adventure and suspense from Innes, who is a reliable old hand at this genre. Nevertheless, his latest novel comes as a surprise. If it were customary to provide bibliographies with these blood-and-thunder entertainments, he could list the most exciting and important works of the last seventy years in the fields of paleontology, anthropology, archaeology, and animal behavior. Far from foundering under an overload of learning, Mr. Innes has neatly condensed the essential information and woven it deftly through a tale of skulduggery in the old-bones trade. The setting is the Greek islands, described with unpretentious skill.