Two famous clans of the Cultivational world, forever at odds because of a curse, are trapped in a war they cannot escape. Until one day, the fateful meeting between the two heirs leads them to a way to bringing an end to the killing. Wei Wuxian leads a double life, both as a leading cultivator and a mysterious dancer known throughout the land as the famous Mo Xuanyu. Lan Wangji, the Second Jade of the Lan Clan of Gusu, a talented and gifted swordsman and cultivator in his own right, meets his match in the wild Wei Clan heir. One born on the full moon of the winter Solstice , the other at the height of the summer Solstice. Prophecy pairs them together, yet will it be enough to save their clans from the suffering of a never-ending war? Will their sacrifices be enough to prevent the collapse of the Cultivational world?

The Cultivation world is in chaos as Wen Rouhan inches across clan territories looking for cultivators with abnormal cores. But why? Does the secret lie within Wei Wuxian whose black core allows him to control resentful energy? Lan Wangji, the Second Jade of Gusu, has sworn to protect Wei Ying, even if that means fighting against his own clan. His love for his dancer is as pure as the white core pulsing inside him. But will it be enough to keep his beloved safe? They are soulmates, Solstice Souls, reborn to love again, to fix the mistakes of the past. Each needs the other to live. They are Yin and Yang, two halves of a whole. The true scope of their power is unknown even to them yet it burns like a black fire and white flame when they are together. Will that power be enough to save the world? Will their love for each other be enough to save themselves from what is coming for them? Or will their enemies hiding in the shadows succeed in claiming that power for themselves?

With war on the horizon, Lan Zhan and Wei Ying are about to face their destiny. Their friends and family are by their side but will it be enough to stop the Wen Clan from taking over the Cultivational World? Both young men have faced their fears and mastered their powers. Their love for each other has united not only them, but their families as well. However, their enemies are strong and numerous and out for blood. Together, the fated Solstice Sons will use their gifts of light and dark to defeat an evil that will do anything to claim their power as their own. Some enemies are known while others are still hidden. Can Lan Zhan discover those who wish to harm his dancer before it's too late? Will Wei Ying once again resist the temptation of more power offered by the Wens? Or will he succumb to the darkness living inside him? This is the final book in the Solstice Souls series and the final chapter in the story of two fated souls who prove that there is no light without darkness.