Fic Title: Fearful Symmetry Series
Genre: Drama, Romance, Angst
Why This Must Be Read: There are a total of 24 stories in this series, most of them chaptered. There's masses of hurt/comfort, romance, dramatic plotlines and excellent characterisation. Even if in general you don't like the idea of Horatio and Calleigh together, you should give this a go because it completely makes the pairing work. It's a well-written, gripping series that will keep you occupied for days.