There are currently 8 chapters in the La Muerta storyline and this is the reading order:
Chapter 1: Descent
Chapter 2: Last Rites
Chapter 3: Vengeance
Chapter 4: Retribution
Chapter 5: Ascension
Chapter 6: Retaliation
Chapter 7: Onslaught
Chapter 8: Primeval
"Chapter 9: Devious" is being launched on Kickstarter.com May 10th! Don't miss it!