"Twists and turns abound in the final instalment of the Spiderwick Chronicles. Bruised and battered, Jared, Simon and Mallory return home to find their house completely ransacked and discover that Mulgarath has made off with their mother and Arthur Spiderwick's Guide. It's up to the Grace kids to defeat the evil Mulgarath and his goblin army, but with only the help of Thimbletack, Hogsqueal and Byron, this might prove much harder than they first thought. But first things first... Mallory, Jared and Simon have to rescue Arthur Spiderwick from Lorengorm and the elves!"