the first couple of episodes seem deliberately confusing in order to draw interest and this does succeed. as the story progresses it manages to incorporate 4 individual points in time and characters into a plot that all are very much linked. although separated by 160 years or so, but staying coherent and relevant to each time line. for me. it borrows pieces from other time related movies, TV etc but does maintain a decent amount of originality and keeps you engaged. a rare thing these days I must add. definitely worth a watch.