Euphoria an Anthology of Thrillers

Elizabeth catches her husband in the act of infidelity with a younger woman. In a blind rage, she flees her husband and tries to sort out her feelings alone in a nearby hotel. She encounters a lurking shadow in the hotel mirror but chalks it up to heightened stress.. She beings to find out sordid information about her husband and the shadow begins telling her that she needs to kill him...Will she listen to the voice or will her sanity prevail?