"Lately, very strange things have been happening on Calle La Pera, 24: The Pisa Cola Gatos don't know whether to continue with the group or not, a very peculiar lady has appeared in the doorway, and everything indicates that Alberto's house has killed someone... and there's movement in 1st A, although there's no trace of tenants. But what's going on? Thank goodness Hugo and Olivia have already started to investigate!"--Adapted from back cover.