Partridge will star as David Lamb, a man on a road trip from Chicago to the Rockies on a mission of self-discovery after his father dies and his marriage ends.
Laurence will play an 11-year-old girl named Tommie, who is described as awkward and unpopular and whom David is determined to help. Jess Weixler ("The Good Wife," "The Disappearance of Eleanor Rigby") is also featured in the cast.
Laurence has appeared in "A Little Game," "Louie" and "The Grief of Others." Partridge co-created the web series "Wedlock," starring Rob Corddry, with Mark Duplass.