Published by Titan Books
21 October 2025
The Jekyll & Hyde detective agency must solve a locked-room mystery in this festive installment of the series.
When music-hall comedy duo Rolly Daconey and Irina Matei are threatened by a mysterious blackmailer, they turn to the Jekyll & Hyde detective agency for help. But the agency is experiencing turmoil and, unbeknownst to Muriel Carew, Henry Jekyll is ever more reliant on the elixir that transforms him into the brutish Edward Hyde.
Still, there’s nothing like a good case to clear the air, and the investigation soon points towards Lady Goodram’s winter artists’ retreat. But once Henry and Muriel arrive at Gaunt Manor, they’re trapped by heavy snow, and they find themselves at the centre of a group of bickering performers, stage magicians and inventors whose long-standing rifts and petty grievances threaten to turn ugly.
To make matters worse, a body is discovered – and the last person with whom the murder victim was seen alive was Edward Hyde. How can the detective agency get to the bottom of the case when their very presence puts everyone at risk?
A thrilling locked-room mystery featuring the most unusual detectives in the business.
Praise for Jekyll & Hyde: Winter Retreat
“Thrills, chills and skulduggery abound in this truly splendid, madcap mystery-adventure from a writer at the top of his game. Books as fun and skillfully conceived as this one don’t come along too often–buy it, read it, cherish it!”
Tom Mead
“Jekyll & Hyde: Winter Retreat is a clever concept, skilfully executed. A magnificent Gothic murder mystery which reimagines and makes deft use of the relationship between Dr Jekyll and Mr Hyde. A thrilling and enjoyable read.”
Guy Morpuss
“Henry Jekyll as a consulting detective – but of course, inseparable from his brutish counterpart, Mr Hyde? Count me in! This latest adventure has a great cast of characters and plenty of intriguing twists and turns.”
Alison Littlewood
“Another blast of witty, fleet-footed fun, written with great confidence and vigour.”
J S Barnes
“An irresistible story for anyone who – like me – loves classic gothic stories of mystery and detection. Such an ingenious twist to reimagine Edward Hyde and Henry Jekyll as an investigative duo, backed by the ever-resourceful Muriel. Fast-paced, with intricate plotting and great characters. It all adds up to immense fun.”
Marisa Linton
Reviews
“An odd-couple detective duo in which the two investigators can’t be present at the same time is an irresistible concept, and a locked-room murder puzzle at a country house in December perfectly fits the Jekyll & Hyde atmosphere of danger, deceit, and secret potions sipped or swigged.” Morning Star
Praise for Jekyll & Hyde: Consulting Detectives
“A wonderful concept, beautifully executed. Delightful and enthralling in equal measure. Replete with a delicious Victorian atmosphere, as thick as a pea-souper.”
Jeremy Dyson (The League of Gentlemen / Ghost Stories)
“Jekyll & Hyde: Consulting Detectives is a fast-paced gothic thriller that is relentlessly engaging, entertaining, and (most important of all) terrific fun.”
Tom Mead (Death and the Conjuror / Cabaret Macabre)
“Tim Major has come up with one of those ‘damn it, I wish I’d thought of that’ concepts: Henry Jekyll as a dissipated Sherlock Holmes to Edward Hyde’s demented Dr Watson. But this splendid novel is more than just a cool idea; it’s a rip-roaring, dark-hearted tale that yokes a cunning murder-mystery plot to the Gothic horror of Stevenson’s famed novella. The sequel can’t come too soon.”
James Lovegrove (Sherlock Holmes and the Highgate Horrors)
“Riveting, ingenious, original. I kinda wish I’d thought of this myself!”
Adam Christopher (Stranger Things: Darkness on the Edge of Town)
“Highly enjoyable, terrifically good fun, very well paced, and full of relish for Stevenson’s original story.”
JS Barnes (Dracula’s Child)
Tim Major 
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