It is the mid-1990s. Sam Beckett, a brilliant scientist, is the creator of the Quantum Leap project - the possibility of moving back and forth through the years of your own lifetime.
But one night his project goes terribly wrong, and Sam is transported back to 1956 by mistake. When he wakes up, he is suffering from amnesia, in the body of test pilot Captain Hank Stratton - which is a problem, as he doesn't know how to fly!
When the project's computer hits on the theory that God, or Time, or Something, was waiting for Sam's Quantum Leap to correct a mistake in Stratton's life, Sam must find out what the mistake was, and put things right. Only to then will he be able to return to the future.
My Two Cents...
Although this book doesn't tell a new story, but instead the story of the first episode "Genesis", it's highly recommended. I myself read it before I had the chance to see the episode and it was my way of getting to know the episode that started everything.
The book tells the episode entirely from Sam's point of view, and allows us to know Sam's thoughts while on that confusing leap, when he couldn't even remember his own name. It's a new and interesting view of the episode, and I think it's safe to say that you won't be bored even if you saw the episode so many times that you know it by heart. And no, it's not just the thoughts that we heard on the episode in the shape of the "voice over", it's his thoughts in every second of the leap.