About the book (from Wikipedia):
In 1969 and 1970, Thor Heyerdahl built two boats from papyrus and attempted to cross the Atlantic Ocean from Morocco in Africa. Based on drawings and models from ancient Egypt, the first boat, named Ra (after the Egyptian Sun god), was constructed by boat builders from Lake Chad using papyrus reed obtained from Lake Tana in Ethiopia and launched into the Atlantic Ocean from the coast of Morocco. The Ra crew included Thor Heyerdahl (Norway), Norman Baker (US), Carlo Mauri (Italy), Yuri Senkevich (USSR), Santiago Genovés (Mexico), Georges Sourial (Egypt) and Abdullah Djibrine (Chad). Only Heyerdahl and Baker had sailing and navigation experience.
The following year, 1970, a similar vessel, Ra II, was built from Ethiopian papyrus by Bolivian citizens Demetrio, Juan and José Limachi of Lake Titicaca, and likewise set sail across the Atlantic from Morocco, this time with great success. The crew was mostly the same; though Djibrine had been replaced by Kei Ohara from Japan and Madani Ait Ouhanni from Morocco. The boat became lost and was the subject of a United Nations search and rescue mission. The search included international assistance including people as far afield as Loo-Chi Hu of New Zealand. The boat reached Barbados, thus demonstrating that mariners could have dealt with trans-Atlantic voyages by sailing with the Canary Current.