'' El Bosque de los Pigmeos '' is an adventure book about the adventures that Nadia and Alexander, two friends, live when they go to Africa with Alexander's grandmother, Kate. They met with a missionary who is looking for two partners that have dissappeared. The bad guys are the leaders of the Brotherhood of the Leopard: the commander Mbembelé, the magician Sombe and the king Kosongo, that has enslaved the tribe of the pygmies.
Nadia and Alexander have powers: Nadia can make herself invisible and she can talk with the animals; Alexander, can transform himself into a jaguar and both two can communicate with the spirits. It is the last book of the trilogy '' Memorias del Águila y del Jaguar '' that began with '' La Ciudad de las Bestias ''.