Nine moons have passed since the devastating battle against the cauldron-born.
In exile along the sea, Cerridwen gives birth to her supernatural child. Upon beholding his sublime radiance, she is unable to kill him, as she'd vowed to do. Instead, she casts him adrift, leaving his fate in the hands of the Great Mother.
Bran convinces the survivors of the battle to gather their families and live under his leadership as one clan. They settle near the Sacred Grove and take the Oak as their new sigil.
Lucia has returned to the isle to train among the Sisterhood, but Bran has not forgotten her. Once the new settlement is well-established, he asks her to return and be his queen, leaving her with a difficult choice to make - will she abandon her training, or ignore her heart?
All of their destinies intertwine, leading them on challenging paths that border otherworldly realms.