A fantasy fiction writer from London, England, Louise Cooper's books are a little hard to find in the United States. They are well worth the search.
The following are her most popular fiction novels.

Time Master Trilogy
The Initiate
The Outcast
The Master

Star Ascendant (prequel)

Chaos Gate
The Deceiver
The Pretender
The Avenger

The Indigo Series
Nemesis
Inferno
Infanta
Nocturne
Troika
Avatar
Revenant
Aisling

Non-series
Mirage
The Book of Paradox

While bookstores online may have a few of her titles listed, the best way I've found to get her books is to search through used bookstores.