Whitethorn is a novel by Australian author Bryce Courtenay.
 It follows a white child in South Africa and was published in 2005.
Tandia is Bryce Courtenay's 1992 sequel to his own best-selling novel "The Power of One".
 It follows the story of a young woman, Tandia, who was brutally raped and then banished from her own home.
 Tandia later meets up with Peekay, the protagonist from "The Power of One" and their stories continue on together.
Colin Henry Wilson (26 June 1931 – 5 December 2013) was an English writer, philosopher and novelist.
 He also wrote widely on true crime, mysticism and the paranormal, eventually authoring more than a hundred books.
 Wilson called his philosophy "new existentialism" or "phenomenological existentialism", and maintained his life work was "that of a philosopher, and (his) purpose to create a new and optimistic existentialism".
Bryce Courtenay, AM (14 August 193322 November 2012) was a South African/Australian advertising director and novelist.
 He is one of Australia's best-selling authors, notable for his book "The Power of One".
Solomon's Song is the final novel in the Australian Trilogy by author Bryce Courtenay.
 It follows the novels, "The Potato Factory" and "Tommo & Hawk", and was first published in 1999.
Sylvia is a 2006 novel by Australian author Bryce Courtenay.
 It is written as the memoir of a teenage girl, Sylvia Honeyeater, during the Children's Crusade of the 13th century.
 She encounters several historical figures such as the Pied Piper of Hamelin and Francis of Assisi.
 It explores themes of religious intolerance, womanhood, abuse and childhood.
The Family Frying Pan is a fixup novel written by Bryce Courtenay.
 It was first published in 1997, then re-written and reissued in 2001.
Jessica is a historical novel based in real facts by Bryce Courtenay.
 It was published in 1998 and like other works from Courtenay covers several years in the life of the main character: Jessica Bergman.
 It was adapted into a mini-series starring Leeanna Walsman and Sam Neill which aired on Australian television in 2004. "
Jessica" was voted Best Mini Series at the 2004 Chicago International Film Festival.
 It twice won the APA Who Weekly Reader's Choice Award, in 1999 and 2000.
The Potato Factory is a 1995 fictionalised historical novel by Bryce Courtenay, which was made into a television miniseries in Australia in 2000.
 The book is the first in a three-part series, followed by "Tommo & Hawk" and "Solomon's Song".
 "The Potato Factory" has been the subject of some controversy regarding its historical accuracy and its portrayal of Jewish characters.
April Fool's Day is a 1993 book by Australian author Bryce Courtenay.
 The book is a tribute to the author's son, Damon Courtenay, a haemophiliac who contracted HIV/AIDS through an infected blood transfusion.
 The title refers to the date of Damon's death, 1 April 1991 (April Fools' Day).

Question: Are Colin Wilson and Bryce Courtenay both novelist?
Answer: yes