CHAPTER XI

Captain Blake's game of solitaire had become an obsession. He drove himself to the utmost in the line of duty, and, through the day, the demands of the flying field filled his mind to forgetfulness. And for the rest, he forced his mind to concentrate upon the turn of the cards. He could not read--and he must not think!--so he sat through long evenings trying vainly to forget. He looked up with an expressionless face as Colonel Boynton entered the room. The colonel saw the cards and nodded. "Does that help?" he aske…