My editor sent me the working titles for the rest of the books in the Search and Rescue series (with the warning not to get too attached, as these could change). There are some tentative release dates, too:
Book 1: Hold Your Breath (April 2016)
Book 2: Fan the Flames (May 2016)
Book 3: Gone Too Deep (June 2016)
Book 4: In Safe Hands (Release Date TBD)