When the Matheson family come downstairs to find that their living room is unnaturally - indeed frighteningly - tidy, they assume it's a break-in (obsessively tidy thieves?). But soon the truth becomes clear. It's Hairy Bill - a brownie or bogle, the Matheson family's very own house spirit. Soon the whole house is redecorated in Scottish Baronial style - deer's heads, tartan aplenty, Scottish landscapes on the wall. The Mathesons don't want to live with a demonic answer to Carole Smillie but the only way to get rid of him is to call in Olly Spellmaker...and she's nearly as bad as Hairy Bill. Dressed in leathers and riding a huge motorbike, she swears she can get rid of the hairy horror - as long as she has the help of the Matheson's son Alex. The thing is, Alex really doesn't want to have to help.