BLOODLINE ZERO
A compass that doesn't just fail to point north but actively points somewhere that isn't north.
The Tagus moves past her in the dark and she can't feel its direction the way she's felt it since she was eight years old and her grandmother held her small hands in the cold water and said wait, just wait, you'll feel it, and she waited, and she felt it, the momentum, the deep gravitational pull of a system that knows exactly where it's going. She's never had to think about water since then. She just knows. Knew.
She is accounting for what she knows. The Vein is degrading. The conduit is absent. The conduit's absence correlates precisely with the moment Veira Ashcroft packed two bags from her Edi