- Published: 12 August 2025
- ISBN: 9780593816776
- Imprint: Berkley
- Format: Hardback
- Pages: 400
- RRP: $59.99
The World's Greatest Detective and Her Just Okay Assistant

















- Published: 12 August 2025
- ISBN: 9780593816776
- Imprint: Berkley
- Format: Hardback
- Pages: 400
- RRP: $59.99
"A sly, intelligent re-imagining of the classic detective novel, pairing a famously irascible sleuth with a self-deprecating millennial apprentice.
As Olivia Blunt navigates the eccentricities of her formidable mentor, Aubrey Merritt, and a labyrinthine case involving a suspicious death among the elite, the novel explores themes of intergenerational tension, epistemic authority and the nature of truth.
Tully’s prose is crisp and witty, her plotting precise, and the dynamic between her leads as psychologically astute as it is entertaining. A savvy, layered mystery with real narrative charm." --Seattle Times
“This novel succeeds through memorable characters at odds with each other (and sometimes themselves) across generational divides. A solidly entertaining read, especially for lovers of traditional mysteries."
—Kirkus Reviews
"A traditional mystery full of quirky characters and humorous situations... The ending may be totally surprising as Aubrey delivers quite the denouement in the tradition of Agatha Christie."
—FirstClue
"This is a classic wealthy-family whodunit centered on a funny and smart pair of women who are opposites in just about every way. Readers will love spending time with this investigatory duo."
—Library Journal
"Readers will be eager for a sequel" --Publishers Weekly
"A well-written drama that had me immediately immersed in all aspects of this wickedly solid storyline that kept me intrigued throughout." --Dru's Book Musing
"Wild applause for this clever and original take on Holmes and Watson--with lead characters who are iconic and relatable from page one." --Hank Phillippi Ryan, USA Today bestselling author
"I can't stop recommending this book to my friends! Fun, funny, and with the best murder mystery I've read this year, Liza Tully's The World's Greatest Detective and Her Just Okay Assistant will both charm you and keep your brain busy trying to guess whodunnit."
-Jessica Payne, bestselling author of Never Trust the Husband and Make Me Disappear