A broker employed to buy or sell property is not entitled to compensation where he fails to act in good faith and disclose to his principal the best terms upon which the transaction can be consummated. Henderson v. Vincent, 84 Ala. 99, 4 S. 180; Morey v. Laird, 108 Iowa, 670, 77 N. W. 835; Carpenter v. Fisher, 175 Mass. 9, 55 N. E. 479; Martin v. Bliss, 10 N Y. S. 886, 57 Hun, 157; Ballinger v. Wilson (N. J. Ch. '02), 53 A. 488. See also Sec. 412a.