Write about the ability to see dead people. Who is the one with the ability? Do the dead have a distinguishing trait that set them apart from the living, or is it impossible to tell the difference? What do the dead people do? Does your protagonist interact with them at all? Maybe they even befriend them. (By the way, if you have not seen The Sixth Sense, I suggest you go watch it immediately. Or, well, after you have written this.)

Write about the ability to see dead people. Who is the one with the ability? Do the dead have a distinguishing trait that set them apart from the living, or is it impossible to tell the difference? What do the dead people do? Does your protagonist interact with them at all? Maybe they even befriend them. (By the way, if you have not seen The Sixth Sense, I suggest you go watch it immediately. Or, well, after you have written this.)