This is the story of Marco and Carla, and their friend Sammie. Young children in a town where weird things seem to happen all around them. Marco always wants to know why something is happening, so he is a total sucker for a mystery and he always has to solve them. Carla and Sammie are always dragged on Marco's mad cap adventures, where they are always running for their lives while saving others. The brother, sister duo along with Sammie take on all kinds of adventures in the series and always put on a brave face. The Adventures of Marco and Carla, will intrigue your young reader and leave them wanting more. Marco and Carla, along with their friend Sammie go off in search of adventure, but sometime adventure comes to them. In the Dark Castle, Marco fines it strange that a lot of people that he is use to seeing have mysteriously disappeared. This sends his imagination racing. Marco is determined to find out what happened to his neighbors, but in doing so Marco, Carla, and Sammie are in for the fright of their young lives.