Sentence:  Her heart beat so fast that it nearly stified her; she stared in <WSD>dread fascination</WSD> at that spectral figure, which was Hugo and yet which was not Hugo, for the face was pale and transparent, the eyes shone strangely — he looked altogether unearthly. 
Meaning of the word marked with <WSD> tags:  A response to something characterized by staring, an inability to move or intervene, and feelings of dread.