The Duke’s Dark Secret by Courtney McCaskill

Secrets, Lies, and a Lock
Ever since her father’s unexpected death, Cecilia Chenoweth has felt like the heroine of a bad Gothic novel. In addition to leaving her alone and destitute, her father made a deathbed confession that it was no mere fever that took her mother’s life some twenty years ago. Then he pressed a sinister key into her hands, bidding her to go forth and uncover the truth. If only she knew where to find the lock that will open to the mysterious key…

Cold, Bold, and Dangerous to Know
There is one man who recognizes the black key bearing the emblem of a snake: Marcus Latimer, the newly minted Duke of Trevissick. Now that his abusive father is rotting in hell where he belongs, Marcus is eager for his life to stop resembling a bad Gothic novel. No one would ever have thought to pair the dangerously handsome duke with the meek little rector’s daughter. But as he helps Cecilia on her quest, Marcus discovers a well of passion hiding behind her sloe eyes that may just be a match for his own.

Two Hearts on a Perilous Path
But Cecilia’s search for the truth about her mother’s death unearths dark secrets from Marcus’s past, secrets that will destroy the new life he has built for his beloved sister and condemn one of the few people he cares about to death. What will he do when he is forced to choose between loyalty… and love?