The reading order for this series is:

•   The Assassins Blade (Throne of Glass ~0.1-#0-5)
  1. The Assassins and the Pirate Lord
  2. The Assassin and the Healer
  3. The Assassin and the Dessert
  4. The Assassin and the Underworld
  5. The Assassin and the Empire
• Throne of Glass (Throne of Glass #1)
• Crown of Midnight (Throne of Glass #2)
• Heir of Fire (Throne of Glass #3)
• Queen of Shadow’s (Throne of Glass #4)
• Throne of Glass #5 (release date September 2016)
• Throne of Glass #6 (release date 2017)