Bachelor on Guard by Lexi Greene

Abby Kercher has spent the past five years proving she doesn’t need Nico D’Antoni, but now her life is in danger and Nico is the only man who can keep her safe.
Abby is all grown up and Nico finds she’s changed in dangerous ways, but some things haven’t changed, like their unwanted attraction, the darkness of his past, and his promise to protect her, which must override everything.
Can they put their past behind them, or will a long-kept secret destroy them both?