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book cover for Don’t Cross Mo Ellery

Don’t Cross Mo Ellery

A Novel

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Pub Date Aug 11 2026 | Archive Date Oct 06 2026

William Morrow | William Morrow Paperbacks


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Description

A laugh-out-loud mystery following the indomitable hot mess Mo Ellery, whose job as a school crossing guard pulls her into an unhinged murder investigation. 

Mo Ellery’s 29th birthday is a disaster. After one small accident—the exposure of her boyfriend’s genitals (well, maybe not that small) on a work video call—she manages to get fired, dumped, and kicked out of their overpriced Chicago apartment. Luckily, a sign appears to guide Mo to her new life: “Looking for flexible part-time work? Become a school crossing guard!” It’s everything Mo has been looking for: health insurance. How hard can it be?

A few weeks later, Mo is adjusting to her new low-paying job, her bisexual reawakening, and her new neighborhood’s wacky characters. There’s Claudia, an old woman who refuses to let Mo help her cross the street, and Marlowe, a tween cell phone prodigy whose antics terrify her. But Mo’s greatest nemesis is Poodle Dude, a guy with an SUV full of poodles who speeds through her intersection each morning. . . until the day he speeds into a sinkhole. Mo tries and fails to shield innocent eyes from his bloody corpse, but succeeds in accidentally becoming the guardian to his three poodles.

And that’s not the worst of it: some of the locals are convinced that Poodle Dude was murdered. Their allegations are obviously ridiculous, but Mo, desperate for distractions—and for several hot neighbor-suspects—reluctantly agrees to help. But Mo the detective is just as chaotic as Mo the underemployed adult, and the three entitled poodles are not helping. When a second local dies under mysterious circumstances, it’s going to take all of Mo’s broadly applicable and transferrable skills to find the killer. 

Murderers beware. . . DON'T CROSS MO ELLERY! 

A laugh-out-loud mystery following the indomitable hot mess Mo Ellery, whose job as a school crossing guard pulls her into an unhinged murder investigation. 

Mo Ellery’s 29th birthday is a disaster...


Available Editions

EDITION Other Format
ISBN 9780063473089
PRICE $18.99 (USD)
PAGES 336

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Average rating from 10 members


Featured Reviews

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Don’t Cross Mo Ellery by Birdie Horne is such a chaotic, fun ride.

The book kicks off with Mo’s 29th birthday going spectacularly off the rails—she accidentally exposes her boyfriend on a work Zoom (yes, like that), and somehow ends the day fired, single, and apartment-less. Rock bottom. But then she becomes a school crossing guard purely for the health insurance, which honestly feels very relatable.

From there, things only get weirder. There’s a guy known as Poodle Dude who speeds through her intersection every morning… until he drives straight into a sinkhole and dies. Mo accidentally ends up in charge of his three very high-maintenance poodles, and somehow also gets pulled into a murder investigation because the neighborhood is convinced something shady happened.

The mystery part is fun, but what really makes the book work is Mo. She’s messy, impulsive, newly embracing her bisexuality, and just trying to survive adulthood. The side characters are quirky in a way that feels cartoonish but still grounded enough to work.

Overall, it’s funny, a little absurd, and perfect if you like amateur sleuth stories with strong chaotic energy. It doesn’t take itself too seriously, and that’s kind of the point.

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