How accurate will it be to the books?From Robert Wolfe:
Since there will definitely be things in the TV show which will contradict the books (Murphy's first name for example) I would not consider the TV show "canon" with regard to the books.
Think of the show as taking place in a parallel universe version of Jim's Chicagoland.
The best analogy I can think of is the first X-Men movie vs the X-Men comic books. Wolverine joins after Storm instead of at the same time. Ice Man is much younger than Marvel Girl. Uniforms are all different. Beast and Angel are not among the core X-Men, etc. But at the end of the day, the spirit of the comics and the overall feel are very much the same (at least to this comic book geek.)
The TV series will not be faithful to the details of the books, but, hopefully, you will find it faithful to the spirit of the books.
Known changes:
-Karin Murphy is now Connie Murphy, because there's already a Karin (or Karen) Murphy on the Chicago PD in Real Life(tm).
-Murphy is now a tallish brunette bombshell and Susan is a petite, cute blonde. This occured in the casting process, when it turned out that the actresses involved actually portrayed the opposite characters better than those they were auditioning for.
-Carmichael is now Kirmani, due to the actor cast in the role.
-Harry's office is now street-level.
-Harry's car is now a WWII style jeep, and not the Blue Beetle. While cramming Harry into an itty bitty bug works on the page, it looked more like a clown car on film, so it was changed.
-Harry's staff is now an old-style classic hockey stick instead of a staff. This is due to being able to pass off carrying the hockey stick in society alot easier than carrying around the staff. They've written in Harry being a hockey fan as part of his character. Jim is fine with this and even got a picture of himself taken with the hockey stick.
-Harry's blasting rod was converted from a drumstick. (Muscian-style, not extra-crispy with a secret blend of seven spices.)
-Bob is now a spirit in the fireplace. Again, this is an example of what works on the page may not work on film...the skull was tested and didn't work. The CGI fire spirit did.