Marion Lineaweaver's knowledge of boats and sailing (see The First Book of Sailing, Watts) commends an otherwise patterned story of a New England summer adventure. Its main ingredients are a boy, 16 year old Dave Jackson of the seacoast town of Striperville, and his new sloop, the Wildfire for which he must pay if he wants to keep both the boat and his skeptical father's respect. The drawback is that Dave's health shuts out heavy work and hence a summer job. But along comes a fishing contest with a whopping prize for the winner- and a clue to a mysterious treasure, ambergris. Dave, after a show of almost uncalled for altruism, wins a little of both and all's well. No high tide, but a pull for the light reading audience.