“Mr. Oppenheim improves with each book he writes, and his latest book is a thrilling and attention-holding tale of much mystery.” -New York Times
“E. Phillips Oppenheim has in this book made a better story than ‘The Yellow Crayon’ one in which the plot unfolds slowly and the denouement is entirely unsuspected. The plot is exceedingly well managed, and the reader is mystified to the end.” -The Delineator, Volume 66, July, 1905
“Mr. Oppenheim’s skill has never been displayed to better advantage than here…He has excelled himself, and to assert this is to declare the novel superior to nine out of ten of its contemporaries.” -The Dundee Advertiser
“Mr. Oppenheim never fails to entertain us.” -Boston Transcript
“The author has acquired an admirable technique of the sort demanded by the novel of intrigue and mystery.” .-The Dial, Chicago
“Mr. Oppenheim is a past master of the art of constructing ingenious plots and weaving them around attractive characters.” .-London Morning Post
“Readers of Mr. Oppenheim's novels may always count on a story of absorbing interest, turning on a complicated plot, worked out with dexterous craftsmanship.” -Literary Digest, New York
“We do not stop to inquire into the measure of his art, any more than we inquire into that of Alexandre Dumas, we only realize that here is a benefactor of tired men and women seeking relaxation.” .-The Independent, New York
“This recent creation of Mr. Openheim’s active and entertaining pen is a pleasing contrast to those depressing literary productions familiarly known as ‘problem novels,’ which discuss sociological dilemmas with much morbid satisfaction. There is nothing in Mr. Oppenheim’s book at all likely to cause mental dyspepsia; he has a stirring narrative to tell, and he tells it as though he enjoyed it himself. This enjoyment is contagious to his readers. England of the present day is the stage on which the characters of “The Betrayal’ move. The plot, a craftsmanlike bit of work, deals with the attempts of French spies to steal English government secrets of immense value. How nearly these attempts came to success and how cleverly they were foiled by Anglo-Saxon courage and tenacity, we leave ‘The Betrayal’ to show for itself.” -The Virginia Spectator, October, 1905
“It is safe to predict for ‘The Betrayal’ a success as great as any Mr. Oppenheim has won.” -The Outlook
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