Based on the novel by Robert Louis Stevenson, The Black Arrow tells the tale of Richard Shelton, a knight who avenges the death of his father during the War of the Roses. Richard is surrounded by enemies, some of whom he considers his most trusted companions.

A strange new virus has appeared, which only attacks strains of grasses such as wheat and rice, and the world is descending into famine and chaos. Architect John, along with his family and friends, is making his way from London to his brother's farm in northern England where there will hopefully be food and safety for all of them.