Seventeen-year-old Elena Carter has always believed that her family’s biggest secret died with her grandmother.She was wrong.After moving back to the quiet coastal town of Santa Lucia with her parents and younger brother, Daniel, Elena begins experiencing strange things inside their new home. At first, it is only small disturbances—footsteps in empty hallways, doors that open by themselves, and the sound of someone whispering her name when everyone else is asleep.Then, at exactly 2:17 a.m., someone knocks on her bedroom door.Three times.Elena knows she should stay in bed.Instead, she walks toward the door.Before she can open it, a message arrives on her phone from an unknown number:DON'T OPEN THE DOOR.A second message follows.Whatever you hear, don't believe it.Then someone outside speaks.“Elena… abre la puerta.” (Elena… open the door.)The voice belongs to her mother.Except her mother is hundreds of kilometres away.Elena backs away from the door, terrified. But then the voice changes.It becomes her brother Daniel.Yet Daniel is asleep in the room across the hallway.And when Elena hears Daniel calling her from inside his room, she realizes something is terribly wrong.There are two voices.Two places.And possibly two people who look exactly like the ones she loves.The next morning, Elena discovers an old photograph on her bed.It shows her sleeping.The photograph was taken inside her bedroom.On the back are five words:YOU SHOULDN'T HAVE COME BACK.As Elena begins investigating, she discovers that the house belonged to a woman who disappeared twenty years earlier. Her disappearance was never solved, and her name has mysteriously vanished from almost every record in Santa Lucia.But someone remembers her.Someone who has been watching Elena.Someone who knows things about her family that Elena has never been told.Soon, Elena receives messages in Spanish from an unknown sender:“La verdad siempre encuentra el camino.”(The truth always finds its way.)“No confíes en nadie.”(Trust no one.)And finally:“Él ya sabe que estás buscando.”(He already knows you're looking.)As Elena gets closer to the truth, the people around her begin acting strangely. Her parents refuse to answer simple questions. Daniel starts having nightmares he cannot remember. Her grandmother's old journals contain pages that have been deliberately torn out.And every night at 2:17 a.m., the knocking returns.Three knocks.Always three.Elena eventually discovers that the mysterious door in the house has a history—and that her family has spent years making sure it remains closed.But what happens when the door finally opens?Because Elena is beginning to suspect that the real danger isn't what's behind the door.It's what might be inside the house already.And the person sending her warnings may not be trying to save her.They may be leading her exactly where they want her to go.Some secrets are buried to protect people.Others are buried because the truth is too dangerous to survive.