For fans of H G Wells or The War of the Worlds I can recommend The War of the Worlds: Aftermath by Tony Wright. It's the first true sequel to H G Wells' original and he really has captured the tone and excitement of the original. It's also only 99 cents/74p at the moment on Kindle, so an absolute steal! It's around 90,000 words and also includes an exclusive short story entitled Thunder Child.
http://www.amazon.com/War-Worlds-Aft...5344952&sr=8-2 (US site)
http://www.amazon.co.uk/War-Worlds-A...5344909&sr=8-1 (UK site)