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The Ex-Perimento

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What to expect

Brought to you by Penguin.

The perfect plan to win back your ex. The rookie mistake? Falling for the man that's teaching you how. When your favourite rockstar offers to be your wingman there's only one thing you cannot do – fall for him. For fans of Practice Makes Perfect and How to Lose a Guy in Ten Days.

Maria Antonieta “Marianto” has her life perfectly mapped out – a long-term relationship with her dream man, Alejandro, and a coveted job at Latin America's biggest digital magazine. But within hours of going viral, everything falls apart. Marianto loses her boyfriend and her job.

Her solution to get them back? Write the article of a lifetime about a series of romantic experiments to win back your ex.

Enter Simón Arreaza, the sexy lead singer of her favourite indie band. After Simón discovers her list of experiments and replaces each idea with one of his own, Marianto is surprised to find that his advice actually works. They end up striking a deal: he coaches Marianto on how to win Alejandro's heart, and she will help raise his band's profile.

But between the fake photo ops and late nights together, the lines of their alliance blur and Marianto starts to question if she really wants to rekindle things with Alejandro.

Because Simón was never part of the plan, and for the first time, Marianto doesn't have all the answers. Maybe she doesn't need to. . .

One wildcard can change everything – will she be open to the possibilities?

'I will go to war for this book. . . their chemistry is delicious.' GABRIELA ROMERO LACRUZ

'A must-read for Abby Jimenez fans' JESSICA PARRA

'A full-hearted love letter to Type-A women and the men who fall for them.' JESSICA PARRA

'Laugh-out-loud funny, irresistibly romantic, and a reminder that the heart has a habit of going off script' CAROLINA FLÓREZ-CERCHIARO

© Maria J. Morillo Flores 2026 (P) Penguin Audio 2026

Critics Review

I will go to war for this book . . . It’s funny, swoony, and made me feel so nostalgic with its incredible sense of place. Their chemistry is delicious.
GABRIELA ROMERO LACRUZ, No. 1 Sunday Times bestselling author of The Sun and the Void
A full-hearted love letter to type-A women and the men who fall for them . . . The Ex-Perimento is a must-read for Abby Jimenez fans. You’ll swoon for this perfecto second chance at first love.
JESSICA PARRA, author of The Quince Project
The Ex-Perimento is a fresh, fun twist on a celebrity romcom! . . . Deliciously swoony and full of humor
JESSICA JAMES, author of For One Night Only
Full of corazón, chaos, and delightfully bad decisions, The Ex-Perimento is a romcom that proves the best-laid plans are made to unravel . . . laugh-out-loud funny, irresistibly romantic, and a reminder that the heart has a habit of going off script.
CAROLINA FLOREZ-CERCHIARO, author of Bochica
Wildly, wonderfully, incandescently romantic
SARAH MACLEAN, New York Times bestselling author
The Ex-Perimento is such a vibrant and refreshing debut! Maria J. Morillo made this celebrity romance feel new and truly original . . . An author you must have on your radar!
MALLORY MARLOWE, USA Today bestselling author of Love at First Sighting
The Ex-Perimento is a charming, electric debut that will leave the reader feeling as if they've watched their favourite 2000s rom-com for the first time all over again. I loved this book and cannot wait to read whatever Morillo writes next!
HANNAH BONAM-YOUNG, New York Times bestselling author

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