"Ace of Shadows"@en . "Heads You Lose"@en . "Department of Danger"@en . . "Ace of Shadows"@en . "__WIKIA_BANNER__ Ace of Shadows is the fourth title in the Christopher Cool/TEEN Agent novel series. It was first published in 1968 by Grosset & Dunlap."@en . . . "__WIKIA_BANNER__ Ace of Shadows is the fourth title in the Christopher Cool/TEEN Agent novel series. It was first published in 1968 by Grosset & Dunlap."@en . . "1968"^^ . . .