Food critic Hayley Snow and her groom, police detective Nathan Bransford, thought Scotland was the ideal destination for two newlyweds.... but they are sharing their trip with Nathan's crotchety mother, his sister, and his brother in law. When Hayley watches a man falls to his death from the famous Falkirk Wheel, no one in the party claims to know the victim, Joseph Booth. Then her mother-in-law's elderly pal, Gloria, insists she'd been poisoned after the salad course at the previous night's dinner. Hunting for clues, Hayley finds that the killer may be someone very close to her heart.