Beacon by Camille Peters

Marisa, the daughter of a lighthouse keeper, spends her days working in an enchanted lighthouse and exploring the different locations it transports her, where she nurtures her unusual powers to manipulate the ocean—until they cause a tragic accident. To pay penance for her mistake and ensure it’s never repeated, she chooses to give up her own voice.
For years, Marisa is content with her self-imposed silence…until the day she saves Prince Owen from drowning. What begins as a noble rescue soon entangles her in a fake engagement…one whose promised reward might not be worth the risk should Prince Owen’s intended discover the truth. Marisa makes every attempt to protect her heart their façade, but the endearing prince makes it difficult to remember it’s nothing but a ruse. The closer they become, the less of a charade their relationship feels, and the more Marisa misses the words that are no longer hers, yearning to finally free herself from her guilt and reclaim her voice.