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Dee Henderson writes a couple of different series - they are more on the romance side, but it's very "light" and you're also caught up in the mystery/adventure aspects as well. There's the True Heros series (deals with the military and other service organizations such as the CIA and FBI) and The O'Malley series (follows a family who's "adopted" themselves and their relationships with one another and the people they get involved with)

I mainly read the romantic suspense type, and other great Christian authors are Terri Blackstock (her Newspointe 911 series is pretty good) and Colleen Coble (I've only read the first book in her series, but it was a really great read!)