Waitrose has launched its festive ad campaign 'Sweet Suspicion, A Waitrose Mystery', featuring a star-studded cast led by Matthew Macfadyen, who investigates the theft of the supermarket's No.1 Red Velvet Bauble Dessert. The 90-second first installment, directed by Lucy Forbes and produced by Saatchi & Saatchi, combines a Christmas theme with a whodunnit mystery, engaging viewers in speculation about the thief's identity. Alongside Macfadyen, the ad includes actors like Joe Wilkinson, Sian Clifford, and Rakhee Thakrar, creating an interactive experience as the mystery unfolds over several weeks. The campaign aims to bridge Christmas advertising with entertainment, encouraging social media discussion and featuring hints through various platforms. A physical evidence board will be displayed at King's Cross Station, with Waitrose staff wearing 'suspect' t-shirts to keep customers guessing. The second part of the ad is set to reveal the culprit in the lead-up to Christmas.