The Freshman Detective Blues by P.J. Petersen
I was quite surprised at this one, I read it many years ago and I forgot a lot of the story. There is enough about relationships in the plot to keep girls interested. As the title implies it is written for high school age children, though I really enjoyed it as a twenty-something year old. Eddie and Jack discover a skeleton in the bottom of Muir Lake which opens up a boatload of questions about what happened at the marina nine years before. At the same time Eddie attempts to woo Wendy Westfall on a scrounger's budget.The character dynamics I found quite entertaining, and the descriptions of boating, scrounging, and tinkering accurate.
I read this for a better idea of how to write scenes that involve boating and docking in different environments.