The spy game

"When the children uncover a strange puzzle in a friend's back yard, it's the start of a "spy game" leading to gold. But first they must make sense of an old photo and a riddle, and learn just who is behind this mystery within a mystery."@en
"When the children uncover a strange puzzle in a friend's back yard, it's the start of a "spy game" leading to gold. But first they must make sense of an old photo and a riddle, and learn just who is behind this mystery within a mystery."
"The Boxcar Children investigate when they find a secret message in their neighbor's path, a message that leads them on a hunt for a hidden object."@en
"When the Boxcar Children uncover a strange puzzle in a friend's backyard, it's just the beginning of the "spy game"--A search for clues leading to gold! The children must make sense of a mysterious old photo and a riddle. But soon the children begin to suspect that there's a mystery inside the mystery. Just who is behind this spy game, anyway?"@en
"When the Boxcar Children uncover a strange puzzle in a friend's backyard, it's just the beginning of the "spy game"--A search for clues leading to gold! The children must make sense of a mysterious old photo and a riddle. But soon the children begin to suspect that there's a mystery inside the mystery. Just who is behind this spy game, anyway'"@en