With its disturbing themes, cinematic storytelling and breakneck pace, Eeny Meeny was very much "Saw meet James Patterson", to coin a screen-style comparison.
Arlidge had dive-bombed the darker end of the crime fiction pool, where the likes of Mo Hayder and New Zealand's Paul Cleave excel, and created a big splash. Eeny Meeny was tabbed a Summer Pick by the influential Richard and Judy Book Club, drew glowing reviews from a swathe of top authors, and became Britain's bestselling crime debut of the year. But Arlidge didn't rest on his laurels.
Forget a book a year: Liar Liar, where a serial arsonist terrorises the city, is the fourth DI Helen Grace tale to hit booksellers' shelves in just 16 months. Eeny Meeny was followed last year by Pop Goes The Weasel, then The Doll's House earlier this year.
"I do write very fast," says Arlidge, "partly because I am very organised and rigid in my planning, but mostly because I love Helen Grace and adore writing these novels. It's a happy accident, serendipity, that just as I hit 40, I found the thing I love doing most in the world."
So enraptured was Arlidge with Helen Grace's potential for an ongoing series that when he pitched his first attempt at a novel to his publisher, he didn't just offer them Eeny Meeny, but an outline of Grace's next six adventures, then unwritten.
"Obviously things do evolve as I write each book, but Helen's future is very much mapped out and the novels all have detailed serial elements for the loyal reader to enjoy. In the next few novels you are likely to discover some pretty amazing things about Helen."
While Arlidge's screen leanings infuse his novels with plenty of pace, tension, and visuals, Helen Grace is the keystone, a motorcycle-riding loner who uses S&M as an outlet rather than drink or drugs.
Arlidge says he was heartily sick of "boring, middle-aged white male coppers" with a penchant for drinking and introspection. A fan of Scandinavian crime for the way it "excels at creating fallen worlds in which everyone is tainted", Arlidge was drawn to Lisbeth Salander (Millennium Trilogy), Sarah Lund (The Killing) and Saga Noren (The Bridge) rather than Inspectors Wallander, Erlendur, or Harry Hole.
"I basically find women more interesting. I can pretty much tell exactly what my male friends are thinking in any given situation, but women are more complex and unpredictable in all sorts of good ways. I think life is still harder for women - which in terms of fiction is good, as you want to throw as many rocks as you can at your key characters.
"Helen is a troubled soul, but hopefully an intriguing one," he explains. "She may be isolated, distant and tough, but we see the root cause of her crushing feelings of guilt and inadequacy, so hopefully we understand her and feel there is enough vulnerability there to temper the steel. The fact she's morally pure and strong is a massive help - she's fighting to gain justice for the vulnerable and oppressed, which always makes us like someone."
Liar Liar by M.J. Arlidge (Michael Joseph $37) is out now.