This one may the best of the awesome and unique series. 
 Tilly Chalmers is a trouble magnet both on and off the job. From the time she dons a dinosaur costume until she is rescued from an assignment, trouble tracks this personal security officer. Her final job seems serious but pretty simple, of course, but nothing in Tilly's life is simple. A serious assignment screw-up make the news, film at eleven, and Heller feels he has to punish everyone involved to protect his company's reputation. He has trouble coming up with something really tough for Tilly that he can live with, so Tillie makes a suggestions that surprises him but fits his great need to protect his company above all things. 
 Life does not turn out quite the way Tilly expects with the changes she suggested. She can't believe that Heller takes away a lot of her job related privileges, but at least she still gets to live "at home" with her Heller's family. 
 If you haven't read the first three books in the series, including the free book, Heller, you will want to read them before you read this one to truly understand the relationships.