The story of the 30-year-old Tom Chadwick, an Englishman who has few roots, little family, and an unsure sense of his purpose in life. Tom inherits a mysterious box of belongings from a great-aunt he never met, triggering a passion to investigate his family lineage. As Tom's interest in genealogy grows, his life evolves in unexpected directions, as he uncovers a world of unusual stories and characters in the U.K. and the U.S., as well as a growing sense of who he is and who his real family is.