The Gourmet Dinner Club travels to Ireland to enjoy Irish cuisine while staying at a medieval, ivy-covered castle. Jane Marsh hopes Dale Capricorn will ask her to marry him at this romantic dream destination. But her plans are put on hold when the elderly castle owner becomes violent, a club member restrains him, and he collapses and dies. The police believe the mysterious death is murder and begin to suspect one of the club's members. Dale leaves for home on a business emergency, and as the lone single gal in the club full of couples, Jane is thrown into the company of Griffin O'Doherty, the handsome Irishman who stands to inherit the castle. Jane must prove her friend's innocence by solving the crime. Which of the sweet-tempered Irish could be a callous killer?