The Greenwood And The Grail — Harper Fox

This is the third book in the Arthur Quartet. Book Four is scheduled for publication in 2019.

Driven apart by merciless currents of fate, Arthur and Lance soon find out how much colder the world is to each of them without the other's love. And Arthur has a fight for the kingdom on his hands, not to mention his struggle to make sense of his marriage to Queen Guenyvre.
For Lance, the loss of his king is too much. On the journey to Camelet, his inner demons overtake him â€" demons that flourish in the lonely moorland nights, and drive him into the trackless wastes of the Forest Wild.
But the Forest is a place of healing as well as madness and grief. After a battle that costs him his dearest blood, Arthur too takes refuge there.
Can the ancient magic of the Greenwood restore Lance and Arthur to their rightful companionship? With Lance at his side, will Arthur begin to understand his destiny as Britannia's once and future king?