Everywhere there are people who feel that the odds are against them, that difficulties in the way are unsurmountable, that it is useless to make further effort to conquer. The author of "The Book of Courage" knows by experience how they feel, and he longs to send to them a message of cheer and death-to-the-blues, a call to go on to the better things that wait for those who face life in the spirit of the gallant General Petain, whose watchword, "They shall not pass " put courage into his men and hope into the hearts of millions all over the world.