One of John Ford's more under-appreciated movies is this biopic of Dr Samuel Mudd, the doctor who set John Wilkes Booth's broken leg after the assassination of Abraham Lincoln. Dr. Mudd (Warner Baxter) is convicted of being a part of the assassination and sent to a Union prison on the Dry Tortugas, a small group of islands off the coast of Florida. The prison island is surrounded by sharks, hence the movie's title. While there he endures brutal treatment and living conditions. When the prison is stricken with an outbreak of yellow fever, Dr. Mudd rises to the occasion and heroically saves lives.
It's solid entertainment directed by one of the greats with a script from Nunnally Johnson and starring a fine cast. In addition to Warner Baxter, who does an excellent job in the lead, the cast includes Gloria Stuart, Harry Carey, and Claude Gillingwater. Ernest Whitman is good as Mudd's friend (and his former slave!). John Carradine shines as an abusive Union guard ("Hiya, Judas!"). Ford's direction is superb, as one might expect, and he wrings every ounce of emotion out of each scene. While some parts of the movie are historically accurate (or at least close), it's inaccurate in many places. The primary example being the portrayal of Dr. Mudd as a complete innocent who knew nothing of Booth before the man showed up at his door with a broken leg. In reality, Mudd was a Confederate sympathizer who had met Booth on more than one occasion. It is true there is no concrete proof that Mudd knew about the assassination plot or knew that Lincoln was dead when Booth arrived at his house, but there is enough room for doubt that we still don't know the extent of his guilt or innocence to this day. But, as I always say with these biopics, I don't look to movies for history lessons but rather to be entertained. On that front, this is very successful.