I love the books that this series is based on, but like almost all of the films and TV series today that are adapted from popular books it bears very little resemblance to the source material. I'm finding that Angie in the series is way nicer than Angie in the books, who is pretty awful to Will.
This episode is based on the 6th book in the series, Criminal. By now Will's relationship with Sara Linton is well established and she is helping him with his work. After all, she is a trauma doctor/medical examiner as well as the widow of Police Chief Jeffrey Tolliver (she'd had 6 novels of her own before Will Trent had had a word written about him). Their relationship is the main reason so many of us continue to read the Will Trent series. So when is she going to appear in the TV version?