In the proximity of the planet Reach, a rescue mission was nearly completed but encased in a slip-space bubble a team of Spartans has to go outside their captured ship in order to repair their plasma conduits before they end up being annihilated by the enemy.
In the midst of the repair a plasma bolt sets a drop-ship, four bodies and one lone survivor adrift to the unstable slips-pace bubble transporting them to a land of magic and might where our survivor will have to learn to live a life of tranquility and carelesness for the rest of his life.
That is... if Destiny has peace and love in store for our hero in the near future.