The Autumn Castle: Kim Wilkins

Book I of Europa.  Christine Starlight lives with her lover, Jude, in a hip artist colony in modern day Berlin. Haunted by a troubled past, she is shocked when her missing childhood friend, May, suddenly reappears. Abducted as a young girl, May now rules over a magical, mythical kingdom where a witch lives in a well, a shape-shifting wolf is her trusted counselor, and fate hangs on the fall of an autumn leaf. But as Christine becomes enamored of this beautiful undying land, May falls dangerously in love with Jude. And as their mortal and immortal worlds collide, the women attract a danger born of both realms - a ruthless killer who knows that Christine can enter another dimension, a place where innocents are ripe for the taking…