The author looks at the underlying strategic situation of Israel and Palestine: demographics, land, nationalism, water etc.
His historical research and use of data is impeccable: he summarises a lot of historical debate and research, dating back to the Mandate Period, succinctly and authoritatively.
His (somewhat optimistic to my mind) conclusion is that the demographic and other trends will absolutely force the two sides together. Neither the right wing (military occupation followed by transfer or ethnic cleansing of the Palestinians) nor the left wing (separation via a cordon sanitaire) solutions are long run feasible in his view.
If I had one small criticism it is that the maps seem to lack detail: but they make the points he is trying to raise, so this is largely a niggle.
This is an excellent and rational summary of what is going on in the Middle East. The last (and very different) book on the subject I enjoyed this much was David Hare's Via Dolorossa.