Downton Abbey meets Agatha Christie in this witty whodunnit. 1917. Vienna. Can Fiona catch a killer AND find a decent cup of tea? File clerk turned British agent, Fiona Figg, is more comfortable wearing a fake mustache than a ballgown. When a royal ball ends with a royal body in the middle of the dance floor, Fiona trades her dancing slippers for practical oxfords and sets out to investigate. As she tracks her nemesis, Fredrick Fredricks, from Vienna to the Austrian countryside, a hunting accident makes her rethink her loyalties. Can Fiona prevent Fredricks from striking again, save her own...

1926 – Christie is a darling of the literary circuit and the most desired guest in London’s glittering social scene. She can often be found at meetings of the Detection Club – where mystery writers come together to share ideas, swap secrets and drink copiously. But then a fellow author's initiation ceremony takes a gruesome turn, and one of the group ends up dead. Now, Agatha is no longer just the creator of great mystery plots – she’s a player in one.

December 1927. Mystery-writer Marius Quin has one previous bestseller, endless looming mortgage payments, and no idea how to write his next book. When his childhood friend Lady Isabella Montague invites him to an intimate New Year’s Eve party hosted by a narcissistic actor, Marius seizes upon the distraction. With his perpetually glum Basset hound along for the ride, he navigates the snowy lanes to the opulent estate of Everham Hall. As the celebrations begin, fireworks light up the sky, champagne corks pop, and then the host is murdered…

London, 1921: Mabel Canning is proud to be a modern woman working for the Useful Women’s Agency, carrying out tasks for gentlewomen from flower arranging to washing muddy dogs. But when she answers the door for wealthy widow Rosalind Despard, she almost chokes on her cucumber sandwich when she finds a soldier’s body on the doorstep. As she offers tea to the policemen of Scotland Yard, Mabel can’t resist getting drawn into the investigation.

What's the best way to purge an unfaithful husband? Become a spy for British Intelligence, of course. Desperate to get out of London, and determined to help the war effort and stop thinking about her philandering husband, Fiona Figg volunteers to go undercover. At Ravenswick Abbey a charming South African war correspondent has tongues wagging. His friends say he's a crack huntsman. The War Office is convinced he's a traitor. Fiona thinks he's a pompous prig. What sort of name is Fredrick Fredricks anyway? Too bad Fiona doesn't own a Wolseley pith helmet.