Stick with it Edgar! This past weekend on the radio here was the 'Big Weekend Of Books' and all programs between 10am and 5pm dealt with books and publishers and book reviews and author interviews - one of the things I heard one author say was that when they got 'stuck' they would go to the end of the book and work backwards! It might be worth a try - work out your ending now and then fill in the gaps between the end and where you are now