
"The Traitor of St Giles" was written by Michael Jecks.
Michael Jecks is the author of over 50 novels inspired by history and legend. He is the founder of Medieval Murderers, and has served on the committees of the Historical Writers’ Association, the CWA and he Detection Club.
Yes, "The Traitor of St Giles" is part of the "The Last Templar Mysteries" series.