There are currently five Throne of Glass novellas - The Assassin and the Pirate Lord, The Assassin and the Healer, The Assassin and the Desert, The Assassin and the Underworld, and The Assassin and the Empire. They are all prequels to the international bestseller Throne of Glass and all have been published by Bloomsbury. Four of the novellas are currently avaliable to buy on E-Book, while the fifth book - The Assassin and the Healer - is apart of a special edition of Crown of Midnight that is avaliable in Paperback in the UK.