The Tripods Disc 1 1 

Hi GMac, Christopher did release a prequel about 10 years later called When The Tripods Came. I did not know about it until about 10 years ago. I read the originals when they came out in paperback. It should definitely be read after the first 3 because of the spoilers.

It's what if the Martians won in War of the Worlds. Sort of.