内容简介：
This book presents two complete adventures. Three boys make big plans for their week off in aSpring Break Adventure.a But first, they have to give their report cards to their parents. Their friend Ronny disappears, and a ransom note turns up. Jim and Ben hunt for their friend and end up tracking down a fifty-year-old mystery. Who kidnaped Ronny? What is lurking in the cave? A treasure map sends the three friends on their next mystery in aAdventureas Price.a Jimas parents tell the boys not to go to the abandoned farmhouse in search of the spot marked X on the map. The boys go anyway and pay a high price. Will Ben survive the adventure? Will Jimas family and friends hate him forever? And what was hidden where X marked the spot?