Any genre works: historical fiction, paranormal, supernatural, drama, comedy, dark noir, mystery, etc. Just make certain your story has something to do with prison or confinement (incarceration). This can include inside a mental hospital, juvenile detention, or other correctional facility.
The Prison Compendium
Bring us your best prison stories. Any genre. Any point of view. The story can be from the perspective of an inmate. It can be from the POV of a guard. It can be from the viewpoint of a family member visiting a lifer. It can be a prison ghost story. It can be about redemption, or a spiral down into oblivion. It can be about friendship, or prison gangs and rivalries. It can be about a riot. It can be about an ex-con, who’s gotten out and is struggling to reintegrate into an unforgiving society. As long as it holds true to the main theme of prison, it fits.