Carolyn Keene 
Riverboat Ruse [EPUB ebook] 

How about a seat at a mystery dinner on a riverboat? Yes, please! I jumped at the invitation to go along with Bess, George, and George’s mom, who was hired to cater the dinner. It’s all fun until there’s an actual theft, and there’s nothing like a good crime to stop a party. Since I’ve got the magnifying glass, it’s up to me to catch "sticky fingers" before this dinner’s sunk.