For Natalie who asked for Gibbs/Kate and 'unseen'.
. . .
Lately, Gibbs has been experiencing the strangest sensation of being watched.
He knows that he is alone in the basement; he has checked every inch of the room for surveillance equipment, has installed a brand new security system and habitually checks the house whenever he comes home.
But the feeling persists and tonight, as he works on his boat, he detects the faintest scent of perfume in the air. It's been years, but he recognizes it instantly.
Impossible, he thinks. Kate is nothing but a memory now, and Gibbs doesn't believe in ghosts.
No matter how much he wants to.