Title: La primera llave (Ulysses Moore #6)
Description: The children are about to discover the true identity of Ulysses Moore. Rick learns that the owner lives in Villa Argo. They are still looking for the first key, capable of opening the gates of Time in Kilmore Cove. The twins, Olivia and Manfred, go to the Middle Ages to look for it but never come back. Last volume of the series.