The Seventh Gate is a novel by Geraldine Harris published in 1983.
The Seventh Gate is a novel in which the hero is on a quest to find a Saviour.
[1] Dave Langford reviewed The Seventh Gate for White Dwarf #66, and stated that "a double-punch finale which fails to surprise you with the identity of the Saviour our hero's been questing for, but then goes one better - pushing fantasy clichés beyond their limits into a kind of realism.
Nifty stuff.
"[1]