Celia L. Grace Book order (chronological)

The Book of Shadows is the fourth novel in the acclaimed series featuring Kathryn Swinbrooke, medieval physician and chemist. It begins shortly after the murderous takeover of the throne by Edward IV and Elizabeth Woodville in 1471, when blackmailers thrived by threatening detractors of the new king.The ugliest threat to the decent people of Canterbury is the magus Tenebrae, who controls the Book of Shadows - a grimoire of spells and magic containing secrets about the dead and the living. When Tenebrae is murdered, Kathryn Swinbrooke is summoned to solve the crime, or else risk the transfer of her love, Colum Murtagh, far away to London. However, the secrets stretch all the way to the King and Queen themselves, and everyone is a suspect - especially Tenebrae's last visitors, a nervous group of goldsmiths from London. Tenebrae is dead but the Book of Shadows still exerts his power, and its new owners will die for it. The suspects fall victim, one by one, to violent deaths, and Swinbrooke most solve the mystery before the Book of Shadows closes on them all.

The Eye of God is the second novel in the unusual new series of medieval mysteries featuring Kathryn Swinbrooke, physician and chemist in fifteenth-century Canterbury. Based on extensive research, C. L. Grace's series highlights the fact that women doctors played vital roles in English medieval medicine, only to be excluded from the profession in subsequent centuries. As the bloody confusion of the War of the Roses rages around him, Richard Neville, Earl of Warwick, gives the precious royal relic the Eye of God to his trusted soldier Brandon, just before Neville is killed. Ordered to take the priceless Eye of God to the monks at Canterbury, Brandon is captured and held prisoner in the city. When Brandon dies under mysterious circumstances and the Eye of God is nowhere to be found, soldier Colum Murtagh is summoned by King Edward IV to find the relic and physician Kathryn Swinbrooke to assess the death. Resuming their unlikely partnership, the two find themselves in an increasingly dangerous situation: A corpse is pulled from a river and another murder takes place in Canterbury, while Colum is tracked by threatening pursuers. As all signs point to an intrigue involving enemies of Edward IV, Colum and Katherine must rely on each other's wits for protection.