Fresh from her triumph of solving the double murder at the Worthington mansion in "Reaching Checkmate," R.A. Huber now finds herself on Santa Catalina Island at the behest of her friend Lillian Robertson.Robertson is struck by "bad vibes" at the household of her twin sister, Mildred Faracelli. Huber secures an invitation to stay at the Faracelli residence on Catalina, where she finds murder committed right under