Under an Evil Star is a thriller based on horary astrology. What led you to choose this as a topic?

Since astrology is such a big part of my daily life, I wanted to extend that into my fiction. But how? Last year, eager to write for radio, I listened to Alastair Jessiman’s great radio plays about a Scottish psychic, The Sensitive, and kept thinking throughout, I need to use my esoteric knowledge in my fiction in the same way. Then I hit on the idea of making an astrologer my main character. But obviously, you need to know who the villain is to study their birth chart. But with horary, a much wider field of possibilities becomes open to you.