Round Robin by Abbie Farwell Brown — Read

Ever since the adventure of the Round Robin on the mountain Captain Sackett had been uneasy. It is not pleasant to know that there are lawbreakers in your neighborhood. Hunting deer out of season was bad enough. But to think of a careless rifle pointed at any creature in brown -- who might have two legs instead of four! The Captain shuddered, whenever he thought of Beverly's narrow escape, and of Nelly's risk. Nobody in Old Harbor would shoot deer out of season; the Captain was sure of that. He was inclined to think it must be some passing stranger who had landed from a boat. Or perhaps it was some shepherd from a neighboring island where sheep were turned out for the summer, with one lonely man to keep them company. The exiles on those far islands who saw no human being for weeks together were apt to get hungry for mischief once in a while.

"We'll keep an eye open," said the Captain to Hugh and Victor after one of their troubled parleys. "Don't let's scare the little girls about it. Only they mustn't go alone on the mountain again."