Paranormal novelist Gideon Harlax is drawn into a battle between the forces of good, represented by alien angel Helith, and the forces of evil, represented by Helith's evil brother Asrael. Ranging from Oxford to Denmark, a North Sea ferry to an alien planet, Harlax unwittingly becomes part of an ancient plot that may result in the destruction of Earth...

One Christmas, a knight garbed all in green appears in King Arthur's Court and challenges any knight to hew off his head on the proviso that he be allowed to return the axe stroke afterwards. All of King Arthur's other knights being frightened, Sir Gawain takes up the challenge and hacks off the green knight's head. The green knight then gives Gawain a year to find his home and live a little before the cut is returned.

Man of leisure Sir Richard (Edward Petherbridge) receives notification that his Uncle has died, bequeathing him his stately country manor and all its lands. On his return to England he immediately sets about taking stock of all legal matters concerning his new property, but during these dealings Sir Richard seems to be more than a little distracted, he hears strange noises from the ash tree outside his bedroom window.

The story is set in late 19th century rural corner of South England. The daughter of timber merchant Melbury, Grace, returns to the town after finishing school. Her father now believes she can find a better husband than her childhood sweetheart, woodsman Giles. She marries handsome young doctor Fitzpiers, but soon finds out he's not the man of her dreams and she still loves Giles.

Through a series of real and imagined encounters with angels, demons, and England's pagan past, a pastor's son begins to question his religion and politics, and comes to terms with his sexuality.

In the future, the government maintains control of public opinion by outlawing literature and maintaining a group of enforcers, known as “firemen,” to perform the necessary book burnings. Fireman Montag begins to question the morality of his vocation…