England, December 1926. Although her personal life is in tatters, the famous writer Agatha Christie decides to leave everything behind to help unravel an unsolved murder committed on a train six years ago, unable to imagine the disproportionate consequences that such a selfless act will cause.

Charismatic adventurer Franklin Blake is on the most important quest of his life - to solve the disappearance of the priceless Moonstone and win back Rachel Verinder, his one true love.

On a Midsummer’s night, four young lovers find themselves wrapped in the dream-like arms of an enchanted forest where sprites lurk and fairies rule.