The Shadowing by Rhiannon Ward

When well-to-do Hester learns of her sister Mercy's death at a Nottinghamshire workhouse, she travels to Southwell to find out how her sister ended up at such a place. Haunted by her sister's ghost, Hester sets out to uncover the truth, when the official story reported by the workhouse master proves to be untrue. Mercy was pregnant – both her and the baby are said to be dead of cholera, but the workhouse hasn't had an outbreak for years. Hester discovers a strange trend in the workhouse of children going missing. One woman tells her about the Pale Lady, a ghostly figure that steals babies in the night. Is this lady a myth or is something more sinister afoot at the Southwell poorhouse? As Hester investigates, she uncovers a conspiracy, one that someone is determined to keep a secret, no matter the cost...