Aku-Aku

thumb|First edition (Norwegian)

Aku-Aku: the Secret of Easter Island is a 1957 book by Thor Heyerdahl published in Norwegian, Swedish, Danish and Finnish, and in French and English the following year. The book describes the 1955–1956 Norwegian Archaeological Expedition's investigations of Polynesian history and culture at Easter Island, the Austral Islands of Rapa Iti and Raivavae, and the Marquesas Islands of Nuku Hiva and Hiva Oa. Visits to Pitcairn Island, Mangareva and Tahiti are described as well.