Stitch by Nia Farrell

When physical therapist Beth Shelton is kidnapped by a wounded man who mistakes her for a doctor, she finds herself in the middle of Godfather Four.
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Physical therapist Bethany Shelton is supposed to be dead. That was the plan when Matteo Visconti kidnapped her by mistake, thinking that she was a doctor. He survived the infection after she took the bullet from him, but he left it to his mob boss father and assassin brother to finish her.
Except they didn’t. After a long, futile search for the man who shot him, Matteo learns that Beth survived and he’s a father.
Beth will do anything to stay alive and raise her son. Matteo doesn’t hesitate to drag her down into his world. He’ll make her want to stay despite the danger, despite the pain. But when you marry into the mob, you don’t just get a crime family. You get their enemies, too.