Luke Bridge is an expert in hostage rescue.
His background and his current situation is explained quite nicely in the opening of his first recorded adventure which reads:
"Luke Bridge was a gun-for-hire. He only worked for good causes though. Those who had something nefarious or illegal in mind need not apply for his services. A former CIA agent, he was well-versed in all forms of combat, and had been stationed all over the world. If there was a situation that couldn't, or wouldn't, be handled by the authorities, Bridge was the man for the job. Even current members of the CIA, FBI, and other government agencies would recommend him to people if the situation warranted his involvement. He wasn't cheap, though he never let the ability to pay determine whether he would take a case. His salary was usually just a means to discover how serious people were in hiring him. There were certain times when he didn't even take a dime from his clients if they really couldn't afford him.
"Bridge was called The Extractor, a moniker he didn't like at first, but really had come to love and grown accustomed to. His main focus really was on helping people he believed needed it. People who would fall through the cracks if they didn't get that help. He wasn't an ex-agent who was still gung-ho on violence or still relived bad memories. Guns weren't something he was especially fond of and preferred not to use them if he didn't have to. They were just a tool for him. Luckily, they were a tool he was proficient at if the need arose. Like now.
Bridge has a partner in his operation. Her name is Nicole (last name unknown to me) and she may not be quite on Bridge's level of experience and capability but the difference is not really worth mentioning. She is tough, highly competent, and utterly fearless in a fire-fight, which is good because the two of them find themselves in such situations quite often. She is also very much in love with Bridge and would gladly see their partnership turn intimate but he has a rule about a) messing up a good working relationship, and b) having any resembling a personal relationship.
[Spoiler Alert: Nicole is not one to give up. When she goes after something, or someone, she usually triumphs.]
Bridge lives for the action and the danger and he gets his fill on a regular basis.