Black opal

"Carmel March, raised by the Marline family, is drawn to Uncle Toby. When Mrs. Marline dies, Carmel is sent to Australia by Uncle Toby. Carmel returns to England, to discover that Dr. Marline was hanged for acrime. She sets out to clear his name."@en
"Carmel March was a foundling left at Commonwood House in Kent as a baby. Secrets dog her days, even in happy times, like Australia. Back at Commonwood, Carmel recollects a murder scene from the past. Why was she rushed away? The more she unlocks her childhood memories, the more she believes the wrong man paid for the crime."@en
"After returning to the England of her youth, Carmel March's mysterious past unfolds, as childhood memories reveal the true identity of a murderer."@en
"An orphaned Englishwoman finds love in the opal mines of Australia. Upon her return to England, she learns she was sent away to protect her from an ugly truth--a murder she may have witnessed which left a memory that she has since suppressed."
"When tragedy struck Commonwood and the household was disbanded, Uncle Toby took Carmel on a voyage to Australia, where she found contentment, although she was always haunted by the mysterious happenings at Commonwood before she left and years later felt an irresistible impulse to go back. Renewing her acquaintance with her childhood friend, Lucian Crompton, she learned of the outcome of the events of years ago, but could not rest until she had unlocked the secrets of her childhood."@en