Eytan Eckstein and Benni Baum are agents for AMAN, the Israeli Military Intelligence.
In the prologue to the first of the three books in the series, Baum was a mission commander and his friend and protege, Eckstein, was a team leader in an assault in Germany against an Arab terrorist that went very wrong and left Eckstein near death. As the main portion takes over, some time has passed and their situations changed but the friendship and the close working relationship remains strong and gets stronger.
Of the two men, Baum is the elder by a good fifteen years. Just turning 50 and now the head of Operations, Baum has been married to Maya for several decades and has three children, a grown daughter named Ruth and two young boys. He is very much respected by the people who answer to him and also, though a bit less so, by those he answers to. Baum's attitude towards all things is a blunt straightforward one with little patience for waiting and none for yes-men. He is a called a child of the "camps" which possibly referring to concentration camps but could mean the displacement camps the Western powers maintained as Europeans flocked to the newly established Israel after WWII.
Eckstein, also of German ancestry, is in his early 30's and is not handling his new life outside of the regular action. His injuries in the debacle in Germany have forced his departure from his unit and he resents the times he is forced to sit behind a desk, looking for any excuse to get back into the field. He has a reputation somewhat deserved for being a hot-shot though Baum knows just how good he really is in a crisis. Eckstein personally still lives with the memory of the fact that, though it was the intelligence that was at fault, it was he who killed an innocent chauffeur and he is determined to not let another accident take place.
Together these two men have adventures which take them to Europe, the U.S. and Africa in a constant fight to strike back at those out to destroy Israel and any country that helps it.