Fatal By Design by Cara Devlin

A summer house party in the countryside takes a deadly turn after the abduction of a viscountess.
After the shocking events of the spring, Audrey Sinclair and Hugh Marsden are adjusting to their new lives when an apparent highway robbery ends in the violent abduction of Audrey’s sister.

As callous as Millie has been in the past, Audrey can’t turn her back on family. She’ll do whatever it takes to find her sister, even if it means working with the man she’s been avoiding for months: former Bow Street officer Hugh Marsden.

Unsettled with his new role in society, and being deemed one of London’s most eligible bachelors, Hugh is happy to fall back on his Bow Street skills to track down Lady Redding—and to see Audrey again. But the viscountess’s disappearance is only half of the puzzle. A long-lost ring worth a fortune could be the driving force behind the deadly events, and as Audrey and Hugh unravel the truth—along with the secrets and complications surrounding their future—a killer closes in on the house party…and selects a new victim.