In the Moons of Borea is a novel written by Brian Lumley. It was first published in 1979 and is the fifth in the Titus Crow book series.
Following the Timelock, the Quester, de Maringy, finds himself on the parallel universe of Borea. Borea - ice-planet - is a ravaged arena of psychic combat between the Warlord of the Plateau, Armandra and the Wind-Walker. This is the sequel to "The Clock of Dreams" and "Spawn of the Winds"