Ashes of Time

November 1291. Meg and Llywelyn gather their family at Rhuddlan Castle to celebrate their seventh anniversary and David's twenty-third birthday. But the joyful reunion goes grievously awry when an old enemy raises the banner of rebellion, followed immediately by an even more catastrophic betrayal by an old friend.
Meanwhile, facing war at every turn and still haunted by his decision to leave Cassie and Callum in the modern world, David chooses a dangerous path forward, one that will either change the course of the future forever—or burn his world to ashes.
Complete Series reading order: Daughter of Time, Footsteps in Time, Winds of Time, Prince of Time, Crossroads in Time, Children of Time, Exiles in Time, Castaways in Time, Ashes of Time, Warden of Time, Guardians of Time, Masters of Time, Outpost in Time, Shades of Time, Champions of Time, Refuge in Time, Unbroken in Time, Outcasts in Time, Hidden in Time. Also, This Small Corner of Time: The After Cilmeri Series Companion.