A game of fire and ice

The first book of the A game of ice and fire series
Summer spans decades. Winter can last forever.
The struggles for her past has just began, can "Kattnah rescue her sister before it's too late with the help of a brooding thief?".

The old gods can't help Kattnah now, with her family dead and her mother having kept her past secret kattnah must become the one thing she fears in order to take vengeance and rescue her sister form the program.