Toast to 80 years of the brilliantly devious Sparkling Cyanide, with its first-ever illustrated version.

From Iris’s blue-flowered dress to the marble tabletops, every fabric and carpet in this award-winning Folio is meticulously rendered to match the atmosphere of the mid-forties, rewarding the sharp-eyed reader in ways only Christie can match.

Raise your glass – but sip carefully – as we honour eight decades of murder, mayhem and the brilliance of Agatha Christie.

We’ve partnered with Agatha Christie Ltd to give one lucky detective the chance to win Sparkling Cyanide, Crooked House and The Pale Horse.

To enter the competition, simply head to the link below and enter your details, and in just one month, a lucky winner will be chosen.

Will you crack the case and claim the prize or will someone else get away with the loot?