Ambler, Eric. <br/><br/>
The dark frontier / 
by Eric Ambler. 
 - Mysterious Press edition. 
 - New York, N.Y. :  Warner Books,  1936, c1974. 
 - xxiv, 279 p. ;  17 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Intelligence service--Fiction.--Great Britain