Q & Q plot
Q&Q is about the two friends, Aristides Quarles van Ispen and Wilbur Quant. They accidentally track down some criminals. Because they are only half believed by the adults, especially the police, they have to investigate themselves. They are helped in this by Aristides's great-uncle, 'grandpa' Reinier Quarles van Ispen, and Wilbur's sister, Juultje.