The devil's mask - Christopher Wakling

Meet Inigo Bright. He's a bored young lawyer working in Bristol after
the abolition of the slave trade. A frustrated artist, at odds with his
wealthy merchant family, and engaged to a girl he no longer loves,
Inigo's dissatisfaction is complete when his boss and mentor, Adam
Carthy, charges him with the numbing task of reconciling years of port
fees and import duties for the newly formed Dock Company. But detail is
the devil's mask.

Inigo's routine investigation leads him to The
Belsize, a ship newly returned from the Indies, laden with rum, sugar,
tobacco, and a chilling secret. Those in the city whose interests the
secret protects move swiftly and savagely to keep the truth hidden at
all costs.

Before long Inigo, his boss and family, are implicated and
under threat. A cover-up seems the only way out. But Inigo has linked
the case to a charred corpse found on a building site in the rising district of Clifton and soon
there are other bodies to account for, too.