When horologist Nora Ashford returns to her hometown of Wrenhaven, Maine for her grandfather's funeral, she inherits a mysterious brass key and a letter revealing a secret he kept his whole life: the condemned lighthouse and clock tower at Widow's Point is no ordinary landmark. Once every generation, on a rare "red tide" when the year's highest tide meets its reddest sunset, the tower's ancient clockwork opens a door into moments the sea never let finish - moments where a shipwrecked sea captain and the shipping magnate's daughter he loved have been waiting over a century to be reunited.
With the town set to demolish the tower before the next red tide ever comes, Nora teams up with local architect Caleb Reyes, her friend Priya, and a conflicted councilwoman with secrets of her own to race against a shrinking deadline - diving a century-old shipwreck, restoring a lost mechanism, and fighting the town council - to save the building, unravel her grandfather's own hidden past, and finally let two lovers finish a story the sea cut short.
Across three books - The Blood Tide, The Keeper's Price, and The Red Tide - the same characters carry the story from grief and mystery, through rising danger and romance, to a costly, moving finale where love, memory, and time itself are finally allowed to come full circle.