Linda Farstein's Alexandra Cooper book series is best read in order, beginning with Final Jeopardy and ending with Terminal City. As of May 2015, there are 16 books in the series, with the newest installment Devil's Bridge due for hard cover release on August 11th, 2015.
Farstein's Alexandra Cooper series should be read in order because the series follows a consistent storyline. The character's story builds throughout the series, which also features references to past installments, thus the series should be read in order to avoid confusion. However, Farstein's standalone novel I'd Kill for That and her other non-fictional works such as Killer Charm, are readable in any order.