A Gentleman of Sinister Schemes by Grace Burrowes

Lord Julian Caldicott has been tasked with discovering who wants the Marquess of Dalhousie dead. Two attempts have already been made on Dalhousie’s life, and the evidence Julian uncovers casts suspicion on members of the marquess’s own family. The dashing heir presumptive to the Dalhousie title certainly has a motive for murder, as does Dalhousie’s embittered aunt, his feuding neighbors, and even his disgruntled staff.

When further attempts to end Dalhousie’s existence put Julian himself in danger, Julian must choose between disorderly retreat and a steadfast pursuit of truth, though either choice might well cost him his honor or his life!