About this book:

Returning to her suffocating hometown of Crestwood after years of estrangement, Nora Marshall is thrust into a nightmare upon receiving a letter penned by her twin sister, Isla – days after Isla is found dead. Dismissed as an accidental fall by her seemingly grief-stricken parents and the local police, Nora's instincts scream otherwise. The carefully manicured façade of her childhood home, the hushed whispers of the townspeople, and her family's unnerving secrecy ignite a terrifying suspicion: Isla's death was no accident.

Fueled by a desperate need for truth and haunted by fragmented childhood memories, Nora begins her own investigation. She uncovers a chilling web of family secrets, a decades-old scandal involving a prominent local family and a missing girl, and a reclusive figure who holds a key to the past. Isla’s coded diary, a child's drawing of a terrifying “monster,” and a series of disturbing discoveries at the scene of Isla’s death paint a horrifying picture of a truth her family is desperate to keep buried. As Nora draws closer to the heart of the conspiracy, she realizes that Isla wasn't just a victim – she was a relentless seeker of justice, and her final act of defiance was leaving a trail of breadcrumbs for Nora to follow.

In a pulse-pounding race against time, Nora must decipher Isla’s final messages, expose the powerful figures who orchestrated a twenty-five-year cover-up, and confront the monstrous truth that connects her family to a deadly past. But as the lines between ally and enemy blur, and the killer watches her every move, Nora discovers that the greatest threat may not be the secrets themselves, but the people who will stop at nothing to keep them hidden. Shadow Sister is a gripping psychological thriller that delves into the darkest corners of family secrets, the devastating cost of silence, and the enduring power of a sister’s love.