The Wrong Lady Meets Lord Right

"When Arabella Grant's wicked aunt dies suddenly, both Arabella and her cousin Lady Isabelle cannot help but feel relieved. She'd made their lives miserable, and now Lady Issie is free to read to her heart's content, and Bella is free from taunts about her ignoble birth. Their new-found freedom is threatened, however, when Issie's great-aunt commands her to travel to London for a come-out Issie has never wanted. Issie, who is in poor health, is convinced she'll drop dead like her mother did if she drops into a curtsy before the queen. So when her great-aunt turns out to be nearsighted and can't tell the noble Lady Isabelle from her commoner cousin Arabella, Issie convinces Bella to take her place"--