"The Clue in the Old Album" by Carolyn Keene (Nancy Drew, Flashlight 24)

Nancy Drew witnesses a purse snatching and runs after the thief. She rescues the purse, but not its contents, then is asked by the owner, a doll collector, to do some detective work. Readers will enjoy Nancy's clever ways of finding all she seeks, and bringing happiness to a misunderstood child and her lonely grandmother.