Nightingale Girl — M.R. Pritchard

Things aren't so wonderful within the Seven Kingdoms of Heaven. Meg promised on Sparrow's life not to leave, but Sparrow's starting to act a little… strange. Again. The daughter of an Archangel and the Devil's own spawn should know better than to expect two tickets to paradise without complications. But sometimes falling in love can change a world-weary country girl. Sometimes following your heart means losing your mind. Book 2 in the Sparrow Man Series.