This book actually contains two complete novels: "Azalea" by Brenda Hiatt and "The Cyprian's Sister" by Paula Marshall.
The rear cover states: "Azalea": "Azalea Clayton was nobody's fool. After the death of her parents and guardian, she was determined to make her own way in the world. When her unscrupulous uncle tried to steal her inheritance, she thwarted him. When her young husband was supposedly lost at sea, she managed to go on. But what was she to do when her husband miraculously returned from the dead...and announced his plans to marry someone else!"
"The Cyprian's Sister": "It was a case of mistaken morality! Miss Bel Merrick was the decorous daughter of a clergyman whose sister, Marianne, had set out to seek her fortune in dubious ways. Before she died, Marianne had attempted to blackmail the nephew of Lord Francis Carey--a mistake Bel soon came to regret. Lord Francis assumed she had followed in her sister's footsteps, and he set out to make her pay for her sister's avarice in kind!"