Entwined Magic by Monica Fairview

Elizabeth and Darcy dream of a peaceful life together in idyllic Pemberley, but when rumors start circulating that Napoleon intends to invade the Kingdom by sea, they are sent with a group of Royal Mages to the coast of Kent to discover the truth.
But the truth is hidden under multiple layers of uncertainty, and they soon suspect they have been lured into a trap. Faced with danger and betrayal, Elizabeth and Darcy must depend on each other to survive. Will their circumstances bring them closer together, or tear them apart? Will the war ever allow Elizabeth and Darcy’s love to blossom? And — most importantly — what sacrifices must they make to find their well-deserved happiness?