Tansy Rayner Roberts describes the story as 'about a pair of retired assassins and siblings-of-choice who run away from their violent profession and end up joining a circus full of dragons… only to have their old and new worlds collide all over again.'
Source:
'Story behind the Story 1', Feathers of the Firebird, 6 January 2017. (https://firebirdfeathers.com/2017/01/06/story-behind-the-story-and-then-authors-on-their-contributions/)