Inish Carraig by Jo Zebedee

SPSFC SPSFC 2022

Post-alien invasion Belfast. Earth has been defeated. Pity the locals aren't listening. Teenager John Dray will do whatever he must to survive. When he's offered desperately needed food in exchange for dispersing a mysterious compound over the city, he takes the job. When it goes horribly wrong, John is sent to Inish Carraig, a forbidding prison, where he discovers a conspiracy that threatens Earth and everyone he loves. He has to unveil the plot. He just has to get out of prison first.

The Chronicles of John Zebedee by Elizabeth Schechter

Cursed with immortality, John Zebedee has resigned himself to spending the rest of eternity alone. Then he discovers an escaped captive in his barn -- the immortal heir to the Elven throne. Ethriel captures John's heart, and gives him hope for the first time in a very long time. But Ethriel's captors are hunting for him, and the rest of eternity may be closer than it seems.