Since Ruby — Bernard Taylor

Eight friends getting together for a companionable evening. But before that evening is over there occurs to one of their number the most horrific and dreadful happening, a happening that shatters their peace of mind and breeds deep and lasting suspicions.
But the years have passed, and the horrors of that evening are long behind them. Or are they? Now, suddenly, eleven years later, new horrors are taking place. One by one, those seven friends are dying....