Edinburgh, 1850. This city will bleed you dry. Dr Will Raven is a man seldom shocked by human remains, but even he is disturbed by the contents of a package washed up at the Port of Leith. Stranger still, a man Raven has long detested is pleading for his help to escape the hangman. Back in the townhouse of Dr James Simpson, Sarah Fisher has set her sights on learning to practise medicine.