The Graveyard of God's Name. Have Body, Will Guard, #12

A Biblical scroll that could change the world... if Aidan and Liam can keep it and the man who found it safe. Husbands and close-protection partners Aidan Greene and Liam McCullough are called to protect a young Oxford student with a valuable manuscript.  Danny Cardozo, a gay, Jewish scholar, has been entrusted with an ancient scroll, a copy of the Biblical book of Leviticus written soon after the destruction of the Second Temple.
When villains threaten him, he heads to an isolated home on the resort island of Djerba, off the Tunisian coast. Danny could build a career as a scholar from the revelations he has discovered in the ancient scroll - if he or any of the elderly men helping him don't die first.