Unsinkable

Death by sinking ship or death by sunlight?
When Chthonia and Paimon boarded the fastest, strongest luxury ship of the time, they expected to reach New York before Chthonia's corrupted twin sister. Instead of the quiet darkened port, where they'd set out arrival arrangements, the two are forced apart when the ocean liner they're aboard strikes an iceberg and begins taking on water. Without ever taking time in her Immortal life to learn how to swim, what choice does Chthonia have but to abandon ship?