Didn't want to hijack Alchemist's thread but the dreaded synopsis was rearing its ugly head again... I didn't have time to mention this earlier, but the best exercise I was ever set, (when I did a one-day course in 'editing your own book') regarding synopses, was this:
1. Write a one-sentence synopsis.
2. Write a one paragraph synopsis
3. Write a one-page synopsis
Do it in that order and that order alone. That helps you to see what is important and must be put in a synopsis and what is unimportant and can be left out of the synopsis. It was suggested that you start with work that isn't your own, but you know really well. As an example, you could try it with Stars Wars episode four, A New Hope... This is just off the top of my head...
1. A young man overcomes the might of an evil emporer's forces, and destroys a death star, making the Universe a safer place.
2. The plans for an evil death star, capable of destroying whole planets, fall into the hands of a young man, who is guided by a Jedi knight to rescue the princess who had sent them. They enlist the help of a smuggler to get the plans to the rebels who are fighting against the evil emporer, and the young man manages to destroy the death star, because of an increased awareness he's been trained in, by the Jedi.
3. Princess Leia is pursued across space by Emporer Palatine's star troopers, and before she's captured, she manages to send two robot droids to the surface of a nearby planet. The droids come into the hands of a young man named Luke, who is startled to see part of a message, where she is pleading for help from Obi-Wan Kenobi. He takes the robots to Ben Kenobi, who reveals himself to be a Jedi Knight, part of an old order that upheld truth and justice, and reveals that Luke's father had been a Jedi Knight. Luke decides to go with Obi-Wan, when his guardians are killed by the Emporer's forces who are searching for the robots.
They enlist the help of a smuggler Captain Solo, who promises to take them to the Leia's home planet. On the journey, Obi-Wan begins to teach Luke about 'The Force' - a mysterious energy that can be called upon by those trained in it. They arrive they find the death star has been activated, but manage to rescue Leia from the death star itself. Obi-Wan sacrifices himself to ensure the others get away, by engaging Darth Vader, a former Jedi knight, who had been seduced by the dark side of the force, in single combat. Vader was Obi-Wan's former pupil, but now does the Emporer's bidding, aiming to stamp out a fledgling rebel alliance. Luke and Solo manage to get to the rebel planet, but the Death Star is close behind.
Luke is disappointed that Solo chooses to leave, as there is a bounty on his head, and he needs to pay it. The rebels attack the death star as it prepares to destroy the Alliance planet. Just as it looks as though it will fail and Vader will destroy Luke, Solo returns and saves him. Luke manages to destroy the death star by trusting in the force, rather than the technology of his space-craft. The heroes are reunited.
That's possily shorter than one page, but you get the idea. The only important people in the story are Luke, Obi-Wan, Vader, Solo and Leia (sorry chewbacca...!), all the others are ancilliary to the plot, and can be left out. It's not important who Luke's living with, what his aspirations are; it's important that his father was a Jedi, and that he goes with Obi-wan and destroys the death star because of the force. Love interest with Luke/Leia/Solo triangle? Not necessary in a short synopsis - it's also unimportant as it doesn't drive the plot one little bit.
Try this with your own work - it focuses the mind really well. And then you can go onto a 1500 word synopsis... where you do bring in the love interest and the fabulous aliens we encounter in the story...