The Physician’s Daughter by Juliet Harcourt

In fashionable Bath, a sudden death is too neatly ruled "natural." Helena Verney, trained secretly by her physician father, spots a discoloration on the body that contradicts the official story—but when gossip turns her father into the scapegoat, she must act. Navy surgeon Gabriel Ashcroft is also in town, secretly investigating a string of suspicious deaths. As Helena's medical eye and Gabriel's authority draw them into the same dangerous web, they form an unexpected partnership—and a slow-burning trust. Together, they must expose a deadly deception before another "natural" death closes the case for good.