Joyful Engagement - Trinity Masters: The Hayden Brothers, #2.5

When planning the grumpy triplet's surprise wedding goes wrong. Warrior Scholar Tate Greene has been given a simple job: mailman. He, along with Roman Tanaka, travel to South Carolina to deliver two letters. Just two. When Tate, Roman, and Scarlet Hall-who has a secret mission of her own-get to Charleston, they find out that they have been sent into hostile territory, and the simple task is far more dangerous than Tate expected.
After a run in with a stun gun, the three find themselves held captive by the very people they were sent to surprise. They'll have to work together to not only escape, but keep a trinity from ruining their chance at a happily ever after.