The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a living—more of a hobby actually, and the Doctor's very, very good at it.

Early 20th century England: while toasting his daughter Catherine's engagement, Arthur Winslow learns the royal naval academy expelled his 14-year-old son, Ronnie, for stealing five shillings. Father asks son if it is true; when the lad denies it, Arthur risks fortune, health, domestic peace, and Catherine's prospects to pursue justice.