The mark of a murderer - Susanna Gregory

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.

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The winter of 1353 has been appallingly wet, there is a fever outbreak amongst the poorer townspeople and the country is not yet fully recovered from the aftermath of the plague. The increasing reputation and wealth of the Cambridge colleges are causing dangerous tensions between the town, Church and University.

Matthew Bartholomew is called to look into the deaths of three members of the University of who died from drinking poisoned wine, and soon he stumbles upon criminal activities that implicate his relatives, friends and colleagues - so he must solve the case before matters in the town get out of hand...

On St Scholastica's Day in February 1355, Oxford explodes in one of the most serious riots of its turbulent history. Fearing for their lives, the scholars flee the city, and some choose the University at Cambridge as their temporary refuge. However, they don't remain safe for long. Within hours of their arrival, the first of their number dies, followed quickly by a second.

When Bartholomew and Brother Michael begin to investigate the deaths, they uncover evidence that the Oxford riot was not a case of random violence, but part of a carefully orchestrated plot. With the Archbishop of Canterbury about to honour Cambridge with a Visitation, and a close colleague accused of a series of murders Bartholomew is certain he didn't commit, the race is on to solve the riddles and bring a ruthless killer to justice.