The Lost Duchess of Greyden Castle

Vanessa never expected that a year after her sister Caroline's violent death, Richard, Duke of Greyden would ask her to marry him. Her dream became a nightmare when she learned that Richard had an identical twin who hated him, a mother who shunned Vanessa, and a sister who might be certifiably mad. And now someone was trying to kill Vanessa...  Gothic romance by Nina Coombs Pykare; originally published by Zebra Books