The Girl in the Green Silk Gown by Seanan McGuire

The second book in the Ghost Roads series returns to the highways of America, where hitchhiking ghost Rose Marshall continues her battle with her killer–the immortal Bobby Cross.

Once and twice and thrice around,
Put your heart into the ground.
Four and five and six tears shed,
Give your love unto the dead.
Seven shadows on the wall,
Eight have come to watch your fall:
One’s for the gargoyle, one’s for the grave,
And the last is for the one you’ll never save.

For Rose Marshall, death has long since become the only life she really knows. She’s been sweet sixteen for more than sixty years, hitchhiking her way along the highways and byways of America, sometimes seen as an avenging angel, sometimes seen as a killer in her own right, but always Rose, the Phantom Prom Date, the Girl in the Green Silk Gown.

The man who killed her is still out there, thanks to a crossroads bargain that won’t let him die, and he’s looking for the one who got away. When Bobby Cross comes back into the picture, there’s going to be hell to pay—possibly literally.

Rose has worked for decades to make a place for herself in the twilight. Can she defend it, when Bobby Cross comes to take her down? Can she find a way to navigate the worlds of the living and the dead, and make it home before her hitchhiker’s luck runs out?

There’s only one way to know for sure.

Nine will let you count the cost:
All you had and all you lost.
Ten is more than time can tell,
Cut the cord and ring the bell.
Count eleven, twelve, and then,
Thirteen takes you home again.
One’s for the shadow, one’s for the tree,
And the last is for the blessing of Persephone.