Tu marcheras sur l'eau

Eyal is a Mossad agent who specializes in terminating those that his agency deems enemies. Upon returning from a mission in Istanbul, he finds that his wife has committed suicide. Until he has been evaluated by a therapist Eyal cannot return to his regular field assignments and is given the task of getting close to the grandchildren of one of the last surviving Nazi war criminals in hopes of finding out where the old man is. The old man has recently disappeared, the man's son is nearing his 70th birthday and his grandson is coming to Israel to visit his kibbutznik sister.

Eyan poses as a tour guide and is quickly accepted by Axel, the grandson and Pia his sister. Eyan spends most of his time with the charming, spontaneous and open Axel but starts forming a friendship with both grandchildren.

Between his emotions over the death of his wife and his growing feelings for the two grandchildren Eyan has a crisis of conscience. Can he violate the trust the two have placed in him? Can he kill again?

Overall this is a well written; many faceted story, remarkably well told. I personally didn't care for the ending but I can't explain too much without giving away what happens.