Check out the classic of the genre of one of the best horror films ever - George Romero's 1968 classic Night of the Living Dead.
Due to a mishap at the registry - this is perhaps the most famous film in the public domain - and adaptations, sequels, and versions are all over the place, including a stage version or two.
Siblings Barbra and Johnny drive to a cemetery in rural Pennsylvania to visit their father's grave. Their car radio goes off the air due to technical difficulties. As they are leaving, a strange, ashen-faced man wearing a tattered suit kills Johnny and attacks Barbra. She flees and takes shelter in a farmhouse, but finds the woman who lived there dead and half-eaten. She sees a multiplying number of strange ghouls, led by the man from the cemetery, approaching the house. A man named Ben arrives, secures the farmhouse by boarding the windows and doors, and drives away the ghouls with a rifle he finds in the closet and with fire, which the ghouls fear.
Barbra, in a state from shock, is surprised when Harry Cooper and Tom emerge from the cellar. Harry has been taking shelter there with his wife Helen and their young daughter Karen after a group of the same monsters overturned their car and bit Karen, leaving her seriously ill. Tom arrived with his girlfriend Judy after hearing an emergency broadcast about a series of brutal killings. Tom aids Ben in securing the farmhouse while Harry angrily protests that it is unsafe before returning to the cellar, which he believes is safer. Ghouls continue to besiege the farmhouse in ever-increasing numbers.
They're coming to get you, Barbra