Amelia Harveston arrives at her grandfather's plantation seeking refuge after her mother's tragic death, only to find a sinister parody of family life. Her cousins, who present a facade of warmth, engage in cruel games and harbor deep-seated hatred, making Amelia their primary target. Isolated and vulnerable, she must navigate the plantation's increasingly alarming 'accidents' and find an ally to escape before she becomes the next victim.

The premise of 'The Secret of Mirror House' suggests a gothic romance steeped in Southern Gothic atmosphere, where the protagonist's vulnerability is exploited by a manipulative family. The narrative appears to focus on Amelia's desperate attempts to uncover the truth behind her relatives' behavior and her own precarious situation. The escalating 'accidents' point towards a suspenseful plot with potentially dangerous stakes for the heroine. The genre conventions imply a strong romantic element will likely develop as Amelia seeks an ally, offering a potential path to safety and resolution.