Bøger i Casa del Arbol (Paperback) serien

Original English language title: Night of the ninjas.

Translation of: Afternoon on the Amazon.

Translation of: Sunset of the sabertooth.

The magic treehouse takes Jack and Annie to a moon base in the future, where they continue to search for the fourth thing they need to free their friend Morgan from the magician's spell.

Their magic tree house takes Annie and Jack to Pompeii just as Vesuvius is about to erupt, and they must find a Roman scroll before everything is covered with burning ash.

Translation of: Viking ships at sunrise.

Their magic tree house takes Jack and Annie back to retrieve a lost story in ancient Greece, where they witness the original Olympic games and are surprised to find what girls of the time were not allowed to do.