Twelve-year-old Gloria St. Romain, Glory to everyone who knows her, has always loved mysteries. She spends her time solving puzzles and reading Agatha Christie books, comforted by the knowledge that truth can always be found for those who look closely enough for it. But when her mom suddenly leaves without a word, Glory is finally faced with the one mystery she can't crack: Why did her mom leave, and where did she go? Sent to spend the summer with her grandparents, Glory is determined to sniff out the clues to track down her mom. And when Glory comes upon Gus, a bloodhound in need of a friend, she realizes she's been paired with the perfect partner to do just that.