As they settle into the cottage on the Overlaar estate for their summer vacation, the four friends – Paul, Roger, herb and Eddie – look forward to a peaceful summer vacations of swimming, biking, hiking, and taking riding lessons on Skippy, Baron Rensdale’s prize horse.
The first few days, however, bring them slashed tires, a mysterious prowler, and a deliberately set grassfire. Paul suspects the events to be related, and soon the four friends are scouring the estate for clues. Their search turns up a roach map which they had lost on their way to the Overlaar estate and a three-fingered glove.
Their detective work leads to a desperate cross –country chase to rescue their old friend from the three-fingered villain.
Piet Prins (pen name for Pieter Jongeling 1909-1985) was one of the most popular Dutch authors of children books. For many years he was the editor of a Reformed Christian daily newspaper, in which he wrote most of his children’s books as serials under the name Piet Prins.