The ocean often represents emotions and the unconscious, so a body discovered by the ocean can represent repressed thoughts or feelings that you have tried to get rid of (kill).

A retreat is a safe place, a place you go to in order to get away from bad feelings and ideas.

Police are authority figures who make sure you do what is right, regardless of whether or not it feels good. In the dream, they are making you face up to the thing that you are avoiding.

A finger can be about "pointing the finger at someone" - saying that they are guilty.

In the closet - "skeleton in your closet" - something that you feel guilty about but wish to hide.

The doctor is the killer. The doctor is supposed to help you, but he is hurting you. This can mean that the solution that you decided on in order to deal with a problem (pretending that it never happened?) is actually making it worse.