This review is from: The Tunguska Fireball: Solving One of the Great Mysteries of the 20th Century (Hardcover)
The Tunguska explosion (a 10-15 megaton blast that flattened almost 2,150 kilometres of Siberian forest), is probably one of those mysteries that will never be fully solved. All you have here (or should I say, all you are left with) is quite a lot of different theories and possible scenarios - and none of them fully gives you the answer to what exactly did happened over Siberia in 1908. This book also doesn't give you one definitive, 100% fool proof, answer as what exactly caused Tunguska explosion (probably no book can give you that), but it will give you several different possible (and impossible) scenarios to ponder over.
Some of the theories and scenarios discussed in book (as what caused the explosion) are as follows: a comet, asteroid, meteorite, ani-matter, mirror-matter, massive gas explosion, nuclear explosion, mini black hole, giant lightning ball, space ship, Tesla's death ray and many more (some of them are actually quite entertaining).
The author also discusses, and in a way shows you the glimpses from life of Leonid Kulik a mineralogist and authority on meteorites, who believed that the Tunguska fireball was a giant meteorite. His four expeditions (which are also detailed in the book) to the site failed to find any remains (which he believed are laying somewhere hidden in the explosion site). The questions that haunted Kulik were pretty much the same as are haunting current researchers: where was the meteorite crater with its raised rim, which should have been created at the moment of impact? And if it wasn't a meteorite, then what caused the great Siberian explosion?
In overall: even though you won't get the definitive answer to the mystery of Tunguska explosion (but then it wouldn't be a mystery anymore, wouldn't it?), this is quite good and fast read for somebody who wants to know almost everything about what happened in Tunguska in 1908. Side note: for me a lack of definitive answer is not a negative point here - since I wasn't expecting a "100% fool proof" solution to the mystery. But I was expecting a book which would give me an overview of several different scenarios with a bit of "history of the Tunguska's explosion" - and this is exactly what I got.