Helen and Morna Mulgray (born 1939 in Joppa, Edinburgh) are identical twins who took up writing after they retired from teaching English at two neighbouring secondary schools near Edinburgh. Helen, inspiring the children of Gorebridge and Newtongrange at Greenhall High School, with Morna doing the same for the children of Loanhead and Bonnyrigg at Lasswade.

• No Suspicious Circumstances (2007)
• Under Suspicion (2008)
• Above Suspicion (2010)
• Suspects All (2011)
• No. 1 Suspect (2012)
• Acting Suspiciously (2014)

• The Twins' website
• Scotsman article
• Interviewed on BBC Radio 4's Woman's Hour (10 August 2007)
• Interview at Iconocast^{[permanent dead link]}