Daughters of Lyra: Heart of an Assassin by Felicity Heaton
Series: Daughters of Lyra, Book 5.
Approx. 27,250 words.
Published on January 2, 2010.
Princess Natalia has spent her whole life on Lyra Five behaving just as a princess should, except for one thing. After her daily duties she sneaks out at night to sing in the bars of Lyra Five, pretending to be someone else. Natalia loves to sing, more than anything else in the galaxy, until the night that Ixion, the handsome commander of the royal assassins, comes to the bar to bring her home.