While Violet is taking an art class in the Netherlands, her friend's father suddenly disappears! The missing mouse is a renowned botanist -- and his disappearance is linked to the mysterious black tulip. The Thea Sisters are eager to help find him. It's an adventure through the flowers gardens and canals of Holland! 

Enter the world of Geronimo Stilton, where another funny adventure is always right around the corner. It was Valentine's Day in New Mouse City, and Geronimo couldn't wait to celebrate! He had sent valentine cards to all his friends and family members. But when he opened his mailbox on the morning of February 14th, it was empty! Had everyone forgotten about him? Was he destined to spend Valentine's Day alone in his mousehole, sobbing, with only his pet fish to console him? It was starting to look like a true Valentine's Day disaster!