Ghost Hotel Series by Larry Weinberg

Anna, an adopted child, has always wondered who her real parents are. When Anna and her family check into a strange old hotel, Anna meets the ghostly Colonel and Mrs. Terwilliger. Her resemblance to the couple's missing daughter is eerie - especially since the young girl disappeared over one hundred and forty years ago!Unable to resist the lure of the past, Anna is drawn back in time to the danger-filled days of the Underground Railroad, which helped runaway slaves to freedom... moreAnna, an adopted child, has always wondered who her real parents are. When Anna and her family check into a strange old hotel, Anna meets the ghostly Colonel and Mrs. Terwilliger. Her resemblance to the couple's missing daughter is eerie - especially since the young girl disappeared over one hundred and forty years ago!Unable to resist the lure of the past, Anna is drawn back in time to the danger-filled days of the Underground Railroad, which helped runaway slaves to freedom. Here Anna discovers the mystery of her childhood - a mystery that must be solved if Anna is ever to find her way home again. less

Drawn once again into the Ghost Hotel, Anna steps back into time when the hotel was a hospital for Civil War soldiers, her mother & father have disappeared & her best friend has been sold into slavery.