A Review of “The Seer’s Stone” Posted By sheila on August 4, 2014 Janice Clark is an American children’s writer, author of “The Hall of Doors” series. She’s written a very nice review of “The Seer’s Stone” on her blog, Tea With the Black Dragon. I’m extra chuffed, because I really enjoy her books too. Posted by sheila Sheila came to La Palma with a six month contract and has stayed 24 years so far. She used to work as a software engineer at the observatory, but now she's a writer and Starlight guide.