Get ready for a holiday filled with surprises and plenty of mix-ups! It is finally Valentine's Day in New Mouse City, and Geronimo Stilton cannot wait to celebrate. He has carefully written and mailed beautiful valentine cards to all his friends and family members. But when he happily opens his own mailbox on the morning of February fourteenth, he finds absolutely nothing inside! Has every single mouse forgotten about him? You will join Geronimo as he faces the gloomy prospect of spending the sweetest day of the year completely alone in his mousehole, sobbing with only his pet fish to keep him company. This is rapidly turning into a true Valentine's Day disaster! But in the world of Geronimo Stilton, a funny adventure is always right around the corner. Will his friends remember him after all, or is there a gigantic misunderstanding waiting to be uncovered? Read this lively, fast-paced chapter book to discover the hilarious truth behind the empty mailbox!