Robers' Roost by Loren D. Estleman from AMOS WALKER The Complete Story Collection

Walker is summoned to the bedside of a dying man.  He is asked to solve the death of a Prohibition era driver who's vehicle broke through the winter ice of the Detroit River.

The dying man, Oscar Chubb, an ex-cop, wants Walker to get enough evidence to prove Specs Kleinstein, a known racketeer and bootlegger, was responsible for his adopted brother's death, who was driving that car.

Walker has to get a vehicle pulled from the Detroit River that has been lying at the bottom for over 50 years.

Even though this is the coldest of cold cases, somebody does not want it investigated.

A solid story.