That Dark Infinity by Kate Pentecost
Hardcover – Little, Brown – Oct 2021 – 384 pages
By night, the Ankou is a legendary, permanently young mercenary – the most fearsome sword for hire in all of the Five Lands, and its most abiding mystery. But when the sun rises, a dark magic leaves him no more than bones. Cursed with this cycle of death and resurrection, the Ankou wants only to find the final rest that has been prophesied for him, no matter the cost.
When the kingdom of Kaer-Ise is sacked, Flora, handmaiden to the royal family, is assaulted and left for dead. Wounded, heartbroken, and the sole survivor of the massacre, Flora wants desperately to be reunited with the princess she served and loved. She and the Ankou make a deal: He will help Flora find her princess, and train Flora in combat, in exchange for her aid in breaking his curse. But it isn’t easy to kill an immortal, especially when their bond begins to deepen into something more . . .