The bookshop owned by the Glynn family—New, Secondhand, and Rare Books: Established 1886—was old, charming, and we’ll-run. So when Matthew Glynn was discovered bludgeoned and strangled in his bookshop office, it was doubly shocking, for who could have done such a thing to one of Penzance’s most respected families? But Superintendent Wycliffe found that the Glynns, like many families, were not what they appeared to be. Between the three brothers, Alfred, Maurice, and Matthew, were…