Lots of mystery in this one - a lone journey by our protagonist, Ellen who finds herself suddenly saddled with a baby after a stranger asks her to hold her for a minute. When the mother is seen to leave the train, Ellen is all the more confused to find a note addressed to her personally asking that she protect the baby and trust no-one. On top of all this - a sinister man on the train appears to be watching her, making notes and taking pictures. Gripping from the beginning.