Used book – The White Circle - 3 - The Valley of Silence, Nora Roberts, Lionel Evrard

There are six members of the White Circle. Six chosen by the goddess Morrigan to fight the demon Lilith and her hordes of bloodthirsty demons. There's Hoyt, the mage; his brother Cian; Glenna, the 21st-century witch; Moira the scholar, heir to the throne of Geall; Larkin the shapeshifter; and Blair the warrior. Having become the undisputed leader of the Geallian people after undergoing the initiation ritual, Moira knows she must raise an army in the land of dragons. On the eve of the impending apocalyptic battle, the Circle must be stronger and more united than ever, but friendship and bravery alone will not be enough. Moira, who has grown closer to Cian, quickly realizes that they will also have to sacrifice their love for good to finally triumph in the sinister Petrified Valley...