Last night (26th November), part two of Waitrose’s Christmas whodunnit ‘Sweet Suspicion’ revealed all. Leaving audiences satisfied in the knowledge of who stole the No.1 Red Velvet Bauble Dessert.

Part one of the campaign saw a star-studded family made up of Matthew Macfadyen of ‘Succession’, comedian Joe Wilkinson, Rakhee Thakrar of ‘Sex Education’, Sian Clifford from ‘Fleabag’, Dustin Demri-Burns of ‘Slow Horses’ and Eryl Maynard of ’Agatha Christie’s Miss Marple’,  sit down for dinner only to  realise someone has stolen the dessert. Macfadyen takes on the case, but audiences were left hanging at the ‘Aha’ moment.

Ahead of the release of part two, the campaign amassed over 150m views across social, TV and digital channels. A reach which successfully made part one Waitrose's biggest ever Christmas campaign. Polls on Waitrose.com and Waitrose social channels saw customers get involved guessing the culprit. Fig the Cat was chosen as the number one suspect (18%), followed closely by Gamma (17%) and May (15%) with the least suspicious being devoted cook, Steve (8%).

Part two sees Macfadyen deliver all in classic Poirot style, outlining the characters' various motives before, spoiler alert, he cracks the case pointing the finger at the unsuspecting Steve.

The detective reveals that Steve hid the dessert in the gingerbread house under everyone's noses. Together the family go out to catch him in the act in the family garden shed enjoying the first bite. The spot ends with the whole family digging into the delicious dessert.

Over the past few weeks the spot has successfully kept audiences guessing with the spot ranking Number One on YouTube’s Christmas Ad Leaderboard.

‘The response to Sweet Suspicion Part 1 has been immense,” says Franki Goodwin, Chief Creative Officer at Saatchi & Saatchi. She continues: "We’ve imbibed the internet gleefully every day since launch as the whole nation has been speculating."

Goodwin adds: “It's been especially fun to watch as all the other brilliant pieces of this campaign have come to life – from the partner T-shirts in stores to the celebrity sleuths, with all of our alibi content being as richly enjoyed as the main ad. So here it is… the big reveal! And to quote a guilty pudding scoffer, “It’s really good”.

With mystery, intrigue and talkability, the festive whodunnit is a masterclass in the power of storytelling. The mystery might be over but the dessert at the heart of the story will be available at Waitrose from December 19th, for all the detectives left hungry from the case.