Valentine's Day Disaster is the 23rd book in the series.
Geronimo celebrates Valentine's Day.
It was Valentine's Day in New Mouse City, and I couldn't wait to celebrate! I had sent Valentine cards to all my friends and family members. But when I opened my mailbox on the morning of February 14th, it was empty! Had everyone forgotten about me? Was I destined to spend Valentine's Day alone in my mousehole, sobbing, with only my pet fish to console me? It was starting to look like a true Valentine's Day disaster!