Fic Title: Haunted
Why This Must Be Read: When Batman won't save himself, Diana decides to take matters into her own hands. Nicely suspenseful tale of Batman, his brooding guilt, and Diana's surprising solution. A great story. The haunting curse is basically Batman being haunted by all those innocent lives he never saved. It's rather perfect for his character, and a nice way to make this fic interesting on psychological level, exploring that vulnerable aspect of Batman's character.
Plus, since this is such a long fic, there are subtle moments here that are priceless. Wonderwoman hanging out with the Batclan, the subtle humor of the characters, etc. But the romance is the best, as they both try to flirt/pretense/outwit one another. As one other reviewer put it, it's seductive without being overly graphic, loving without be cutesy, passionate without being overwhelming, and makes the heart ache every time.