Code Name Duchess by Hanna Hamilton

In sickness and in health, and in the world that awaits beyond…

Miss Winnifred Keating is desperate. With her brother missing and little to no power in her hands, she has but one choice if she wants to see him again: work with the most insufferable Duke she has ever met.

Seth Dunn, Duke of Cambolton, will stop at nothing to get his sister back after she disappeared without a trace. Even if that means calling a truce with an opinionated lady who hates his guts.

Pushed together by their shared goal, their search for their missing siblings awakens not only new feelings but also a beast from the past. And it all starts with a letter, detailing their siblings’ very own funeral.