The moment the Grace family moves into the dilapidated Spiderwick Estate, strange things begin to happen. Jared, a curious, adventurous boy, quickly seeks out and finds the hidden laboratory of his great great uncle Arthur Spiderwick. He unleashes a mysterious force when he locates a field guide full of the secrets of the magical creatures that inhabit the forest surrounding the mansion. His twin brother Simon is calm and reserved but is rapidly drawn...

A geophysical team, who are investigating the effect radiation from other solar systems has on the Earth, learn that the core of the Earth is heating up and warn the President of the United States. While the leaders of the world race to build 'arks' to escape the impending doom, volcanic eruptions and earthquakes of unprecedented strength wreak havoc all over the world.