A witty mystery by the author of the popular ""Angel"" series. Barry Harrison, 10, and his sister Robin, 12, look ahead to the long days of summer and decide that what they need is adventure. And adventure they get, when their mother purchases a lakeside cabin to be their summer home. As soon as Barry, his friend Spencer, Robin and Mrs. Harrison are settled, they find themselves in mysterious circumstances, and begin to wonder about the cabin's previous occupants. When a ghostly voice wakes them up, calling to them to leave the area, they set to work in earnest to solve the mystery. Nighttime, spooky events are balanced with the happy daytime activities of an outdoor summer--swimming, fishing, hiking. And gradually, the children piece together the clues to solve the mystery, discovering some new friends in the process. This book ends with a hint of more mysteries to come, and a series based on these cheerful, resourceful characters would be welcome. Skillful writing, appealing characters, and real suspense combine to place this story a cut above the usual fare. Large print and simple sentence structure make it accessible to younger children, yet it should satisfy an older, slower reader, or one who simply wants solid, relaxing summer fare. A winner!