"This Cursed Line" by Morgan Hubbard

This book has such a unique premise!  It's kind of like if the Devil went down to Georgia looking for a soul to steal, and he found one and stole it.  And then he doomed that person to go out finding other souls to steal until they paid him back the debt they owed, and their children and children's children and so on would have to keep doing that too.  Until the debt is paid in full.  Except, he went up to Washington instead of down to Georgia.
Kind of.  This is a tricky book to explain.  Let me ...