As Luck Would Have It: Harding Hall Mysteries (Unabridged‪)‬

This is the fourth book in the Harding Hall Mystery series.

Lars and Loris Harding continue their adventure. The missing pieces of their family mystery are finally added when they team up with their nemesis-turned-pal, Sir Donald Badminton. Once again, they prove to be the luckiest men in England. 

Illustrations can be found at hardinghallmystery.com.