Plain Sight by Katherine Rhodes

Even secret agents get fired.
Bridget McInnis never thought she would be dismissed. So when her boss at MI6 showed her the door, she was left aimless, homeless and drifting–and suddenly winging back to Pittsburgh. A bored agent was a bad thing.
Her brother Killian asked his friends at Walsh-Tyndale if there was a job she could do while she figured herself out. She finds herself as a temp secretary for Vaughn Willard, a newly promoted manager–and a newly made widower.
Vaughn didn’t expect to be a widower. Finding a laundering scheme in the Walsh-Tyndale books was a fluke. The launderers didn’t see it that way and Vaughn’s wife paid with her life. He simply wants to get his life back on a track and Bridget was there to help.
Especially when the bad guys come back to try and make sure Vaughn can’t testify against them.
Everything Bridget learned from her agent days comes rushing back when Vaughn’s life is threatened. They have to run, and with Vaughn’s son in tow, they make their way through Midwest trying to figure out to keep themselves safe, how to bring the launderers to justice– and how to deal with the dangerous attraction they feel for each other.