When a mysterious lodger called Dolf Hunter comes to live with 12-year-old Sam Kenyon and his family, it's the beginning of a seriously spooky adventure.

For Sam has seen the man before - in a nightmare. He discusses the shifty new tenant's arrival with his best mates - Hannah, Dean and Amy.

They decide to trail him - and learn that Dolf Hunter makes sinister straw-dolls that will allow them to visit each other's dreams.

Each child has a separate dream kingdom; Sam's is a forest, Amy's a moonscape, while Dean's is in the mountains and Hannah's is centred on a most unusual city...At first, the children have fun visiting each other at night in their imaginary kingdoms.

But soon they become increasingly aware of a building menace.

For while they are trying to stalk the lodger, someone - or something - is stalking them in their dreams.

Something that will use Sam and his friends to spread its smothering influence over all the waking world ...