Mreen and Emlee are gifted with psi powers that give them the ability to sing magical songs that simultaneously provide heat and warmth that keep the inhabitants of their planet (Nevya) alive through its five year winters. Emlee, however, struggles with a memory of a past the prevents her from using her powers. But through a trip with Mreen to a distant city, she will learn how to use those powers as well as how to change the lives of a stableboy and his sister.
I'm not really much of a fantasy novel fan anymore, but this is a beautiful tale with superb detail, as well as a serious subplot about spousal abuse. The characters have great depth and capture you and the reading goes very quickly. I found the naming convention (Emlee = Emily and Mreen = Maureen, in case you couldn't figure it out) a bit distracting, but that's a gimmick of the genre so I would imagine that if you like fantasy books, this one (which is the fourth in a series) will please and delight.