I am another big Gerritsen fan. I have read all the Jane Rizzoli/Maura Isles books (The Surgeon, The Apprentice, The Sinner, Body Double, and Vanish), and am now working my way through the other books of which I have read Life Support, and Call After Midnight. I wouldn't say that Call After Midnight is a romance - it's still a thriller.
Warning about these books - once you start you can't stop, so make sure you have a few hours spare when you start.