The Pickle King by Rebecca Promitzer

Bea Kludnik lives in Elbow, where it rains 24/7 during the summer. Most people leave Elbow in the summer. The ones who can't afford to hit the road end up growing mold between their toes from the constant rain and mud.

This summer starts out the usual way - with rain. But then Sam shows up and takes Bea and her camera to an old, dilapidated house. Up the front stairs, into the foyer to a hole in the floor. Bea can see water in the hole - and something else. Something floating up toward the hole. It turns a bit and Bea realizes that she's seeing a dead body. A dead body of a man who's missing an eye! She quickly takes a few pictures then she and Sam scram. But Bea leaves with more than just a few snapshots. The ghost of the dead man is following, and he wants Bea, Sam and their friends to avenge his murder.

This was a good mystery with twists and turns, memorable characters, and a plot intricate enough to keep my interest. I recommend it to mystery fans, but be warned that it is a bit on the gross side.