Unlikely Heroes (St. Brendan #3)
Carla Kelly

To counteract the growing threat from across the English Channel, Able Six has been recalled to the fleet. Thanks to a legacy from the legendary Sir B, Able and his Gunwharf Rats—workhouse boys like him—will serve as ship-to-shore messengers in Sir B’s own yacht.
Able is torn. His loyalty to England and the Royal Navy is strong, and he knows his duty, but there is loving wife Meridee to consider, and their small son, Ben. Is the cost of war finally too high, even to a man so committed?
What awaits Able Six is more than war—someone from his past he could love or hate. Able Six knows his puny concerns mean nothing, as a battle that will change England forever edges closer. Trafalgar.