In the Lonely Hours by Shannon Morgan

In a remote corner of northwest Scotland lies Maundrell Castle, a centuries-old stronghold with a tragic and terrifying history. Recently inherited by Edwina Nunn, who had no prior knowledge of her wealthy benefactor, the castle is a haunting new home for her and her teenage daughter, Neve. Perched on an isolated island, the castle's austere architecture and the eerie, blood-tinted waters of Loch na Scthanna, or the Lake of Shadows, cast a bewitching spell.

Upon their arrival, Edie and Neve discover that Maundrell Castle is not just steeped in history but is also inhabited by numerous ghosts. Among them, a frightened spirit gazes longingly out of the windows, captivating the newcomers and drawing them into the island's dark legends. Central to the mystery is the Maundrell Red, a priceless diamond that vanished decades ago and is believed to be cursed. This gem is thought to be the catalyst for a series of family tragedies, each occurring on Samhain, the Scottish Halloween.

As Samhain approaches once more, Edie and Neve find themselves racing against time to unravel the castle's secrets. They delve into a twisted story of bitter cruelty and hidden love, where the lines between the living and the dead blur. With the weight of the castle's history bearing down on them, Edie and Neve must uncover the truth behind the Maundrell Red and the spectral inhabitants, or risk becoming another tragic chapter in the castle's haunted legacy.