Dead End - C. D. Moulton - Bog

Some people have bought a bit of land on an island to build a marina. The natives try to tell them t won'twork. Clint tells them the reason is not because the Indoos don't want them there, it is because there is no access for larger boats. Then an attempt is made on the man's life. Then it gets complicated when a bunch of greedy "investors" show up. Then the murder...