The Mill House Mystery by Florence Warden

In the half-dark passage Rhoda stood, alone, when Jack Rotherfield had left her, uncertain what to do.

The first impulse of thankfulness and delight, in the thought that she had rescued Sir Robert's favourite picture, that in a few moments he would be congratulating himself on its safe return, was quickly succeeded by a feeling of horror, of dread, when she realised the ever-increasing difficulties of her own position.