On their way back home, Lola, Lucie and Pat come across an old abandoned house. Lola is really excited and wants to explore, but Lucie and Pat seem reluctant. As soon as they enter the old building, strange things start happening. "Ghosts? Yelp!" But Pat's bloodhound instincts come to the fore, and he soon discovers the strange goings-on are the Guanos devious work. It's the pigeons hideout and they're not too fond of intruders. Lola and Lucie end up locked in a cave, forcing our hero to use all his ingeniousness to get rid of the birds and free the girls.