
Published April 10th, 2025 by Century
Mystery, Cozy Mystery, Crime Ficiton, Humorous Fiction
Welcome to my review for this compelling cosy crime debut. Thank you to Century for sending me a copy of the book in exchange for my honest review.
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ABOUT THE BOOK:
Prepare to be hooked by this deliciously smart locked-room mystery featuring an irresistible grandmother and granddaughter sleuthing duo.
‘Miss Marple meets Only Murders in the Building. Entertaining from start to finish‘ Jennie Godfrey
‘Agatha Christie brought bang up to date‘ Clare Mackintosh
‘Wickedly sharp‘ Lucy Clarke
‘So gripping and atmospheric, I barely made it out alive‘ Steve Jones
‘Slick and witty‘ Daily Mail
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Two unlikely detectives. A killer cocktail of suspects.
A Gibson martini garnished with three silverskin onions is 77-year-old Mimi’s favourite cocktail. It is best served with a crossword puzzle, not as an apéritif at Jane Ireland’s extravagant auction party.
But given Mimi has been blackmailed into attending Jane’s event, at a grand old mansion on Mackinac Island (Michigan’s answer to The Hamptons), there are worse drinks she could spend an evening sinking.
Thankfully for her, she’s roped her granddaughter, Addie – who is escaping the heartache caused by her manipulative ex-fiancé – into accompanying her. While Addie spots celebrities and socialites in the manor’s labyrinth of dark rooms and Mimi wonders how to confess the real reason for her presence at the soiree, a scream pierces the air.
Jane is dead.
And when a second body turns up, Mimi and Addie soon become the unlikeliest of sleuths in a race to narrow down the suspects.
In a house that contains as many secrets as the people within it, it’s going to take more than a Gibson to survive the night…
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MY REVIEW:
Witty, whip-smart, glamorous and claustrophobic, This Is Not A Game is a dazzling locked-room whodunit. The story is set in a luxury mansion on Michigan’s Mackinac Island, where 77-year-old Mim has been blackmailed into attending a charity auction. She has taken her granddaughter Addie – who is trying to escape her own heartache – along for moral support. But everyone gets more than they bargained for when the host, Jane, is murdered. And Mim is the prime suspect. Then, as another person turns up dead, the mansion’s drawbridge door is stuck raised, and a storm prevents help from reaching them, Mim and Addie decide to try and find the killer. But as they search the house’s labyrinthine halls, all they seem to find is secrets. Can they unravel the clues and find the killer and clear Mim’s name?
This was a treat from beginning to end. Skillfully written, cunningly crafted, and steeped in the trademark twists and turns we expect from the genre, Kelly Mullen has created a sensational debut that feels both nostalgic and totally modern. Atmospheric and wonderfully descriptive, the story came alive around me and I felt totally immersed in its pages. It feels ideal for the big screen and that finale was one that Ms. Christie herself would have been proud of.
In protagonists Mim and Addie, Mullen introduces us to a brilliant new crime-fighting duo that I absolutely adored. Mim is a sassy and sarcastic septuagenarian who loves a Gibson martini and crossword puzzle, while Addie is a feisty and savvy game creator who draws on her game plotting know-how to help her solve the murders. The background characters are the perfect mix of likeable and loathsome, helping to create a number of plausible suspects. As in any good locked-room mystery, the house is like a character in its own right, and this one is an eerie, claustrophobic and oppressive place with a maze of rooms.
Suspenseful, slick, classy and funny, this compelling cosy crime is not to be missed. I’m hoping that this isn’t the last we’ve seen of these delightful amateur sleuths as I need more from this entertaining duo.
Rating: ✮✮✮✮.5
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ABOUT THE AUTHOR:

Kelly Mullen has worked as a producer in Hollywood and as a marketing executive in New York and London. During the pandemic she took online writing courses through Curtis Brown Creative and The Novelry, which reignited her childhood passion for writing. Her debut novel, This Is Not A Game, publishes in April 2025.
As an executive producer, her credits include Academy Award-nominated Trumbo starring Bryan Cranston and Helen Mirren, and AppleTV+’s Dads produced with Ron Howard. Her creative work for brands has won over 50 awards, including Cannes Lions and Clios.
Born and raised in Iowa, Kelly is now a dual citizen of the UK and US. She lives in London with her husband and their rescue cats.
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BUY THE BOOK:
Bookshop.org* | Waterstones* | Amazon*
*These are affilate links
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Thanks for reading, Bibliophiles xxx
