Written and created by Christopher Guest and Jim Piddock, Family Tree is a documentary-style comedy series conceived and produced in the manner of Guest's feature films. The story revolves around the journey of the 30-year-old Tom Chadwick (Chris O'Dowd), an Englishman in his 30s who has few roots, little family, and a somewhat unsure sense of his purpose in life. Having recently lost his job and girlfriend, 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 expands and evolves in unexpected directions, as he uncovers a world of unusual stories and characters in the U.K. and the U.S., as well a growing sense of who he is and who his real family are.