Leepike Ridge by N.D. Wilson

Eleven year old Thomas Hammond has always lived next to Leepike Ridge. His house is chained on top of the ridge for fear of it toppling off in high winds. One night, unable to sleep, Tom heads down to the stream that borders their (his mother and Tom) land. He discovers a large piece of refrigerator foam lying on the bank of the river. He tentatively steps on it with one foot, two feet, and miraculously it held Tom’s weight! What seems to be an aimless trip on the river, Tom falls asleep and then the aimless trip on the river turns into the deadly rapids that suck Tom into an underwater cavern. Read Leepike Ridge to find out what happens.