Corie Geller has what she wanted: she's married to a handsome, considerate and rich man and is mother to his daughter, Eliza. She gave up full time FBI work (as her husband gave up a fancy law practice to become a federal judge) and works in an Arabic language literature niche, doing occasional FBI contract work on the side. Now self-employed, she meets with a group of other self-employed folks on Wednesdays for lunch. She's happy and yet she is vaguely dissatisfied.
Then she begins to notice Pete, who is in the Wednesday lunch bunch. He picks the same seat religiously, watches his car out the window while they lunch, seems incredibly low-key and boring, and yet there is something. He reminds her of her, with her careful bio with attendant details that gives no clue about the FBI. So, using her many investigative skills, she starts asking questions, looking things up, involving her retired police detective father, who does need something to do. Then things begin to heat up.
Just remember the title: "Takes One to Know One."