Pairing: Martha Rodgers/James Watson, Kate Beckett/Richard Castle, Ashley Magnus/Henry Foss
Fic Title: Stranger than Fiction
Rating/Warning(s): PG-13 (language and violence), spoilers for Castle up to Rise (4-01)
Genre: angst, romance
Why This Must Be Read: I've read a couple of Castle/Sanctuary crossover before this one, and all of these have one thing in common: Martha/James. And let me tell you that it just works. For this only, this fic is a gem. It's not a Castle in the Sanctuary world, or Sanctuary in the Castle world kind of crossover: the shows are perfect equals, exactly what everyone loves in a crossover. This fic is just awesome, perfect even. And if you're of fan of both shows, let me tell you, you won't be able to stop reading it once you've started.