For the twentieth anniversary of the start of the Matthew Bartholomew series, Sphere is delighted to reissue all of the medieval monk's cases with beautiful new series-style covers.

Medieval physician Matthew Bartholomew returns for his latest case amongst rumours of war

Chaloner faces a barrage of problems in the latest case for the 17th-century spy

Medieval physician Matthew Bartholomew returns for his latest case amongst rumours of war

Thomas Chaloner, the 17th century spy, solves a new dastardly case

The final instalment of the popular medieval chronicles featuring fourteenth-century Cambridge physician Matthew Bartholomew