The Iron Crown by M.A. Grant

After the last Faerie Civil War, the leaders of the magickal pantheons stripped the shining Seelie Court of its power and tasked the dark Unseelie Court with maintaining the natural balance of the world.

Ages later, a twisted intrigue throws the balance of all Faerie into ruin and ignites a new civil war.

Discounted by his family and haunted in the Unseelie sidhe, Queen Mab’s youngest son, Lugh, leads the Wild Hunt on quests across the dangerous Wylds. At his side is his best friend, Keiran, a Viking rescued from death centuries earlier. Between Lugh’s uncanny gift for being in the right place at the right time and Keiran’s power of persuasion, they’re revered across the Wylds—as long as Lugh keeps his true identity hidden from the people of the Sluagh.

Keiran and Lugh have loved each other for centuries—as friends and brothers in arms. Lugh has long since put aside his romantic love for Keiran to protect their friendship. But with the looming war in Faerie and the ghosts of the dead dogging Lugh’s every move, Keiran realizes there may be room for romance between them after all, if only they can survive.

Rallying the Sluagh to fight in the looming war between the Seelie and Unseelie seems an impossible task. To achieve it, these childhood best friends will have to free Lugh from the restless souls haunting him and turn the tides threatening not only their growing love, but the balance of life and death itself.