It's Nora. I don't really think I can say much more than that. She's published hundreds of books in her career and The Collector follows the same pattern / style that is typical for a Nora Roberts book. We've all read the scenarios before and there's nothing truly groundbreaking here, but it's more like a comfort read. I know when I sit down to read a Nora book I'll be engrossed in the story and not want to put it down. I'll like the romance and the thrill of solving the mystery. 
 It's true there are some of her books that click more for me than others. I would say The Collector falls somewhere in the middle. 
 I'm always impressed how much research goes into her books. At least from my untrained brain all the facts and histories sounded legit. 
 One thing I usually like about Nora Roberts' books is the fact that she'll incorporate more than one couple in a story. She does so in The Collector, but I felt like the secondary couple (Julie and Luke) weren't given as much page time as I would have liked. I love the whole love rekindled trope and wish Nora would have spent more time exploring their restarted romance, but they were overshadowed by everything else going on in the book itself. 
 Other than that The Collector was a typical Nora read for me. Somewhere down the line I may decide to pick it up again.