When Carlos and Julie Brown go to Mexico with their parents to help out at a village orphanage, Carlos investigates the ghost sightings, strange illness, thefts, and other mysterious events that threaten to close down the orphanage.
Julie and Carlos are investigating strange happenings in town that seem to be centered around the orphanage. One of the first things they see is what appears to be a ghost (even though Julie and Carlos don't believe in ghosts). Then they uncover a secret workhouse where workers are forced to smuggle items hidden in other products to buyers across the Mexican border. This was a very good mystery.