Knot on My Watch by Alora James

They may be able to protect her from danger, but can they save her heart from being broken?

Callista Birk wants to run away from all her family responsibilities. Yet when her father arranges for her to be married to a smug newly elected senator, she finds herself caught in the middle of an elaborate assassination attempt. Callista ends up running into in the arms of three powerful Alphas on the security team who trigger her heat.
Wanting nothing more than to keep her safe, the Alphas whisk Callista away to a well protected island. Their mission is dangerous and their reputation is at stake, but they struggle to resist her sweet charm and the pull of a beautiful Omega in heat. The problem is that Callista is to be claimed by another. Can the Alphas give her up once the mission is complete?