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When brother and sister Dan and Helen build an observatory in their shed they see a mysterious object falling from the sky.

When Dan and Helen go in search of the object that fell from space, they find themselves coming face-to-face with danger.

Dan and Helen encounter a strange thin man, and discover a boy called Peep-peep who speaks a bizarre alien language.

Dan and Helen take Peep-peep to meet Mr Bunting at the observatory, where they try to understand his alien writing.

When Peep-peep is taken ill, Mr Bunting drives him to the hospital in his car, but the country roads are full of danger...

Mr Bunting and Peep-Peep are taken captive. Meanwhile, Dan and Helen make a break-through. But where has Tom gone?

While Dan and Helen tell a confused Tom all about what's been going on, Mr Bunting and Peep-peep encounter trouble.

Dan, Helen and Tom set out to find Peep-peep and Mr Bunting, but their search takes them closer and closer to danger.

When Tom and Helen are captured by the thin space man, it is up to Dan to set them free.

Will Dan succeed in rescuing the others?

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