The lives of four young passengers aboard the maiden voyage of the RMS "Titanic" become linked, and while Paddy stows away, Sophie and her mother are delivered to the ship by the police, Juliana watches as her father's wealth barely conceals his madness, and Alphie harbors a great secret.

Four children aboard the Titanic--Sophie, Paddy, Juliana, and Alfie--believe the famed killer Jack the Ripper is on the ship with them, and the urgency of their mystery deepens as the "unsinkable" ship hits an iceberg.