Alice and Lloyd think school is pretty boring. That's until strange things start happening at Greenworm Primary. Strange things like a fire in the barn, a UFO in the sky and famous spies and tough guys showing up in the middle of classes. Little do they know that their school is in the middle of an amazing saga dating back to the very first spacemen. The Mystery of Greenworm travels back fifty five years to a space ship crashing into a Siberian field and forward to an amazing climax that you will not see coming.