One Step After Another by Bethany-Kris

He finds the unfindable, but she’s terribly good at hiding …

Penny Dunsworth is dead.
Well, she should be—a piece of her certainly is. The broken girl she once was no longer exists. Now a trained assassin for The League, she’s turned into the worst nightmare for the monsters who once haunted her every waking moment. She has to be … it’s the only way to keep her past safe. That is if she can keep it from catching up.

Luca Puzza is chasing a ghost.

He’s never once been able to catch her in the five years that he spent searching. Until now. The promise he made to find the girl who disappeared without a trace turned into an obsession that changed his life. But the woman he was looking for is only a shadow of who he finds. She’s dangerous … for his heart and life, and so are the secrets she’s protecting.
One can only play with monsters for so long before they start to notice you’re not the same. In this world, predators can just as easily become prey.

Except she stopped being a victim long ago.
And it’s time for this to end.

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Note: One Step After Another is book one of the After Another trilogy following the same couple over a journey that takes them from present, to past, to future. The books should be read in order. The trilogy discusses triggering topics that may be uncomfortable for some. Please be advised and read at your own discretion.