So, the mega-legus eating monsters pile through the hole. Dexter and me tumble backwards and I think that the creatures will fall on us and eat us right away. Somewhere, Mrs Next-Door is screeching like mad and will soon be another victim.
'It's drooling on me!' cries Dexter from beneath brown and matted fur.
'Try not to swallow! It is most likely poisonous!' I advise, helpfully.
Already the hot air down here is reeking of old meat and nasty wet stuff. I can hardly breath underneath it all. Four thousand claws scratch at my face.
'Sorry, Dexter!' I shout. 'At least we will not have to put up with the new baby-child!'
'It's licking me!' cries Dexter. 'Aghhhhhhhh!'
'WHAT ARE YOU BOYS DOING DOWN THERE???!!!' Mrs Next-Door bellows into the understairs void. She must have opened the door. Bad move.
There is a fantastic clawing and growling and scrabbling and the beasts fling themselves out of the under-the-stairs-cupboard and onto her throat. Probably. The door slams shut. There is silence whilst they devour their prey and then quite a lot of barking.
'Come along, boys!' chirrups Mrs Next-Door, who must still be alive. 'I don't know how you got into this house but now it's time for a bath!'
We crawl up to the hall and peek the door open. There are muddy paw-prints all over the hall floor, lots of jackhammer scratches on the parquet, a small hill of rubble by the front door and a mountain of mud that Dexter was supposed to be dealing with. I hear the car door slam outside.
'Right,' says Dexter, 'I think I'll be off now, you can keep the jack-hammer for a bit.'
And he runs out of the back door.