Murder on Astor Place by Victoria Thompson
One evening, Sarah, a midwife in late 19th century New York, is called to a boardinghouse to deliver the owner’s baby. A guest walks in during the delivery, and for an instant, Sarah thinks she recognizes her and calls out a name, startling the young woman. The guest leaves, and Sarah spends the next several hours delivering the baby. When she returns later to check on mother and child, she is surprised to learn that the young female guest has been murdered.