Keeping her eyes fixed steadily on the other's face, Tuppence replied quietly: "Money  " Mrs. Vandemeyer started.
Tuppence could not look her in the eye and kept her head bowed down. 
mnli hypothesis: Tuppence could not look her in the eye and kept her head bowed down.  premise: Keeping her eyes fixed steadily on the other's face, Tuppence replied quietly: "Money  " Mrs. Vandemeyer started.