Book six in the Hilda the Witch series.
Hilda goes on quite a remarkable sailing trip and ends up in place no one knew exists.
"I hope I am not disturbing your peace," said the house, "but there is a gentleman with a bow who is aiming at the pole for the messages and it looks like he - "
" - as I already was afraid, he is not very proficient at this," the house finished. There was no comment from the two magical people who lay draped over the purple couch.
"It chipped some paint too," the house tried, but even that shocking announcement was not enough to evoke some movement. "Fine. Be like that. I'll just fall apart around you and maybe you will notice someday."
A black shape dropped from a bookshelf, landed on all fours with barely a sound and tip...