The Time Tourists

Imogen was four the first time it happened. As she flipped through her grandma's dusty photo album gazing into the faded, monochrome faces of her grandma's somber family--relatives with funny names like Aunt Ada and Uncle Paul and Aunt Phyllis and Uncle Gordy, and second cousins Percy and Viola from Missoula--suddenly, the universe tilted, and for a brief instant Imogen found herself inside of one of the pictures.

One of only a handful of individuals who can time travel through photos, she e...