Cocoa Crush, Book 35 in the New York Times Bestselling Mystery Series by Jessica Beck.
When Suzanne and Jake leave town to attend a party with friends, they never dream that they are about to become involved in another murder. The stakes continue to rise as an ice storm knocks out the power in the penthouse where they are staying, locking them in with a dead body and a killer until law and order--as well as the power--can be restored.