The Sunfall

Three cousins-a disgraced knight who sets things on fire, a scholar princess who reads too much, and a duke whose daughter is a phoenix (she's not technically alive, but don't tell him that)-accidentally void a thousand year old peace treaty with a stolen magical sewing needle while on a treasure hunt.

Now a dead queen is suing them.

And the frost fairies are attacking their kingdom.

They have to find a solution before there's nothing left to save.