When Ghosts Call Us Home by Katya de Becerra

Haunting of Hill House meets found-footage horror in this edge-of-your-seat thriller that explores the power of family ties and the trauma that lurks there.
When Sophia Galich was twelve, she starred in her older sister Layla's amateur horror movie Vermillion, which recorded raw footage of her very real reactions to scenes her sister concocted in their old Californian house on the coast-Cashore House.
In the years after the film's release, Sophia's relationship with her sister became more strained, while her memories of the now-infamous house fueled her nightmares. Vermillion amassed an army of fanatical fans who speculated about the film's hidden messages, and it was rumored that Layla made a pact with the devil-her soul in exchange for fame and arcane knowledge. Sophia dismissed this as gossip...until Layla disappeared.
Now, Sophia must study the trail of clues Layla has left behind, returning to the very place where it all began. As she gets closer and closer to Cashore House's haunted heart, she must once again confront the ghosts of her childhood. But the house won't reveal its secrets without a fight.