Synopsis critique

Would you mind taking a look at a four page synopsis for me before I send it out to a few publishers? I would greatly appreciate it, and it would certainly help my understanding of publishing. If yes, the synopsis is below, if not, that's fine, too.
Thanks,
Josh Franklin
SYNOPSIS
Escaping to the Fire

Alex Montgomery and his three younger siblings live in a battered household. With their mother gone and a raging alcoholic as a father, Alex fears for their safety. One night, fed up with the problems, Alex decides that it's time for him and his siblings to escape.
They do just that in the middle of the night on a rain drenched highway, outrunning their dad and one of his drinking buddies, nearly dying in the process.
Alone and tired, the four drive through the night and into the morning toward California and a new beginning. It is on the dawn of the next morning that they are hit by what can best be described as a whirlwind that sucks the VW bus into the sky and away to some unknown land.
On arriving in this strange world, the four must outrun a dragon flock, avoid a stampede of some unknown animal and fear attack from a medieval castle all in less than ten minutes.
Alex leads his dazed and confused family out into the grayish emptiness, trying to figure things out only to be chased back to the safety of Fire in the Sky by bandits.
Upon his return, the family is introduced into an elaborate world of half medieval life mixed with odd placements of futuristic reality and present day commodities. He is also introduced to the holy text of the clouds, the Truth Trio, which depicts a great savior much like Jesus beaming up to the castle around the same time as him and his family. This person will battle evil and give an immense sacrifice to try and save them and the world from fates unknown.
During this time, the castle is attacked by the renegades that threaten to take over the clouds and destroy everything. They claim to have found the key to the power of Gods, an ancient myth that explained Zeus and the gods of Olympus and their power.
Alex must decide whether to join the ruthless but logical enemy or stay with the defensive and just as violent saviors of his family but deny his beliefs.
When the renegades call for war and deaths begin, Alex elects, with his family, to stay at Fire of the Sky instead of turning over to Trenton of the enemy, angering the violent, tyrannical leader. Trained as an expert dragon rider, Alex helps push back the renegades and save the castle, but in the process, his younger brother is killed in the battle.
To avenge the death, Alex assembles an army of his followers to attack the renegade camp. During this attack, Trenton captures Alex and forces him to listen to his propaganda, which, once again, makes perfect sense to Alex, but the death of his brother keeps him from joining the renegades.
Retreating back to the castle, Alex is confused and dejected. His belief structure twists into something he used to understand but now can't. The idea of killing so many innocent teenagers and children draws him into a deep depression, causing him to lose hope.
The renegades, having recruited many new followers from the surrounding area, attack the castle once more, this time defeating the defense and ransacking it of all of its supplies. Also, to punish Alex for going against Trenton, the renegades are ordered to kidnap both of his sisters in order to lure Alex to their camp where Trenton plans to force Alex to see the truth about the clouds.
Trenton leads Alex and his sisters, held captive by a troop of guards, deep down through a system of caves to the center of the clouds, to the essence of the clouds.
Trenton tells Alex that the core of the cloud held the power of the gods until an uprising led to demise of their greatness and ultimate end of existence. He also said that everyone beamed up has been chosen by the clouds to replace those gods of past and reign supreme over the world.
Alex and his sisters escape in the middle of the night, let out by a defecting renegade and return to the castle to inform them of Trenton's plans. They return, however, to a civil war in the power structure of the castle. Half of the castle wants to turn against Alex, the other wants to overthrow the powers at be.
Seeing that his warnings are going unheard and realizing the desperation of the situation, Alex heads out on his own to take Trenton out or die trying. He follows Trenton to a bridge that seems to lead into thin air, literally.
Trenton has the essence of the clouds and escapes to the center of the disintegrating cloud bridge. He tells Alex he has two options: turn back and let Trenton go on to wherever the bridge leads, or follow Trenton and chase him forever until Trenton rules all and destroys Alex and quite possibly the world.
Alex chooses to attack Trenton, risking destroying the essence of the clouds and pulls them both over the edge of the cloud, falling forever.
The epilogue is the four siblings, among many of the friends meeting years later on the beach right by where the four were beamed up. They are celebrating Alex's brave life and his sacrifice to save the world, even if he did destroy the powers of the cloud, the castle and send all of the teens back to earth.