Three of the five authors of “The Peace Puzzle,” a new book published by the U.S. Institute of Peace (USIP), appeared at an Institute forum on February 19, sounding notes of pessimism about near-term peace prospects but also calling for U.S. leadership on the sort of preparatory work that can lift public expectations in the region out of its current despair and lay the groundwork for a future effort to negotiate a two-state solution to the Israeli-Palestinian dispute.