Underworld Books in Order

Underworld gathers Sophie Lark’s earliest mafia romances into one gritty, fast-paced world. These books crisscross Chicago, Paris, Warsaw, and London, following Russian Bratva bosses, thieves, assassins, fighters, and the people reckless enough to love them.

Many readers first meet this world through the Colors of Crime pairings, which bundle two complete stories into one volume. In Sapphire, jewel thief Lex Moore makes a living seducing and robbing wealthy men until she picks the worst possible target: Detective Byron Black. He should arrest her, but instead becomes obsessed, even as Italian mobster Luca Diotallevi chases the same priceless gem. Their cat-and-mouse triangle mixes heists, investigation, and very messy feelings. Black later brings Byron back to London, where he reunites with childhood neighbor Holly Summers, now a high-profile political adviser whose campaign is being stalked by a bomber.

Other volumes dive deeper into the Bratva side. Emerald introduces Sloane, an assassin who sneaks into a mafia king’s bedroom with a syringe of poison and wakes up his prisoner instead. Snow centers on a bare-knuckle fighter so numb they call him Snow, and Sasha, the young woman trapped in a debt she can’t pay unless someone is willing to fight for her. Roman follows a former “prince” of the Bratva who once made high school hell for Mila; years later he’s the head of the Paris mafia, and she finally has a chance at revenge.

In Dom, a job gone wrong leaves a Bratva soldier holding the police commissioner’s daughter hostage. Lara should be nothing but leverage, yet their forced proximity reveals her own secrets and a darkness that mirrors his. Violet, Crimson, and the other color-titled stories spin out additional romances around singers, socialites, and schemers who get pulled into the orbit of men like Anton, Nikolai, and Luca, all of them dangerous in different ways.

The tone across Underworld is dark, violent, and unapologetically steamy. Kidnapping, underground fights, and power plays are common, but so is the sense that each couple is fighting their way toward something softer in a brutal world. Recurring side characters pop up in later series, so if you love spotting connections, these books offer a rougher, earlier look at the universe that eventually leads into Brutal Birthright and Kingmakers.

Every novel stands on its own with a complete romance and ending. You can dip in anywhere, but reading the Colors of Crime and Underworld titles in publication order lets you feel the escalation of stakes and the way Sophie experiments with different tropes inside the same bloody, glamorous underworld.