Blood Brother — William M. James

DOUBLE TROUBLESomewhere out in the mixture of desert and rock that lies under the heat of the sun is an Indian who claims Cuchillo Oro's identity. An Apache who calls himself by the same name and who has a knife exactly like Cuchillo's own. ...Enraged, Cuchillo sets out on an endless search for the man pretending to be his blood brother ... a vicious murderer and defiler of innocent women ... a savage impersonator whom the white eyes believe is the real Golden Knife.