Better late than never…
Five on Finniston Farm 2
and
The Adventurers and the Continental Chase by Jemma Hatt
“And look—what’s that over by the bank there?” said Betty.
They all looked. They saw a house-boat there, badly in need of a coat of paint. It was very old and had been left to rot to pieces. It had once been a good one, and had had plenty of brass rails and white paint. But now it was a sorry sight. Plainly, no one had used it for ages.
The children make an exciting discovery in The Boy Next Door.