The 4th King [Volturi] on hold
A deal was made on the snow-covered battlefield the day of the battle between the Cullen family and the Volturi coven. That 7 years after the birth of Bella and Edward Cullen's children, when they have matured, they will visit the Volturi coven in Italy for the kings to observe the changes the girls had gone through.
Mirielle, to young to remember the confrontation with the Volturi, will be meeting the kings for the first time in her memory. She meets the 4th king Jace.
Jace is ruthless, possessive, and lonely. His brothers have had their mates, yes his brother Marcus lost her, but he still had his at a point in time. Finding his mate in the daughter of the two vampires that annoy him the most was not what he expected.