The final season of "Lost" took everyone on one last, cross-dimensional ride towards eternity. We saw how being a candidate can be deadly, found a new way to reunite with the dead, and discovered a new meaning for the phrase "Man in Black." Months later, we're either just starting to reflect on it all, or cursing that we ever looked for answers in the first place. For those who still don't regret the last six years, "Lost: It Only Ends Once" takes one final look at the end, and all that came after. The author of "Lost Episode Guide For Others" and "Lost: The Island's Greatest Hits" helps sum up the final 18 1/2 hours, and updates his list of the 42 greatest episodes, characters and scenes of all time. In the process, he shares his own journey inside the Lost fandom, and helps fellow Losties heed the show's final message "To remember....and to let go.