The boy who is the main character lives in a remote Scottish (or maybe it was Scots-Canadian?) village and is sort of unofficially adopted by the village midwife/nurse. He never feels like he quite fits in with the kids his own age, especially after they say nasty things about his unknown mother, so he starts hanging around with the older boys and getting into trouble. Meanwhile, there's a mysterious ghost in the lake, a suspicious man wanting to open a mine everyone thought was played out, and a variety of characters, both trustworthy and suspicious, to fill out the mystery cast. In the end, the mystery is resolved and the main character has the opportunity to grow and change. The sudden revelations about his parents are unrealistically dramatic and amazing, but otherwise it's a satisfying story.
ISBN: N/A; Published 1973 by Scholastic; Received through Bookmooch