The Fire Chronicle

[1] After the tumultuous events of last winter, protagonists Kate, Michael, and Emma long to continue the hunt for their missing parents.

But they are soon discovered by their enemies, and a frantic chase sends Kate a hundred years into the past, where the various non-human sapients (Dwarves, Elves, Giants, Dragons, Trolls, etc.)

Meanwhile, Michael and Emma set off to find the second of the Books of Beginning (the eponymous 'Fire Chronicle', which enables its user either to revive the dead, or to restore an individual's sense of purpose) which they ultimately win from the Dire Magnus' subordinates with the help of an Elvish colony.

Meanwhile, as Kate spends time with Rafe, she gradually falls in love with him, and ultimately dies to save him despite knowing that he is going to be the next version of the Dire Magnus.

With the help of the Fire Chronicle, Michael is able to revive Kate back to life but unfortunately learns that Emma has been kidnapped by Rourke, one of the Dire Magnus's most trusted subordinates.