She's Already Inside: Terror Aboard the Celestial

She's already inside. And she's not leaving. The Celestial has carried fifteen thousand colonists across the void for generations. In sixty days, they'll finally reach their new home-a living world beneath a real sun. For the Peterson family, it's the beginning of everything. But something else is already on board. When four-year-old Emily begins talking to an imaginary friend named Emmy, her parents aren't worried.
Children invent things. Especially on a ship where the walls never change and the stars never move. But Emmy isn't imaginary. She knows things she shouldn't. She moves where no one is watching. And she's been waiting in the dark far longer than anyone realizes. As strange malfunctions ripple through the ship and the line between reality and nightmare begins to blur, one truth becomes impossible to ignore:The Celestial is not alone.
And whatever is inside. is learning. With time running out before planetary arrival, the Peterson family must uncover the truth-before the thing hiding in the walls decides it doesn't want to stay hidden anymore.