This is a reprint of one of John P. Marquand's classis Mr. Moto adventure/spy series. Aspects are a bit dated, but the author tries to present the inscrutable East to unfamiliar Westerners.
From back cover: Calvin Gates, a failure at both Yale and business, must succeed as a sleuth if both he and Sylvia Dillaway, the beautiful fellow American whom he meets on a train bound for Mongolia, are to reach their destination unscathed. Mr. Moto will try to steer them out of the path of danger, but paving his emperor's way into Northern China must, as always, be his first concern. If Japan's number one secret agent makes even one slip on his current mission, honor will dictate death before disgrace for him, and disaster for countless others.
From back cover: Calvin Gates, a failure at both Yale and business, must succeed as a sleuth if both he and Sylvia Dillaway, the beautiful fellow American whom he meets on a train bound for Mongolia, are to reach their destination unscathed. Mr. Moto will try to steer them out of the path of danger, but paving his emperor's way into Northern China must, as always, be his first concern. If Japan's number one secret agent makes even one slip on his current mission, honor will dictate death before disgrace for him, and disaster for countless others.