Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 6th entry in Gaslight Mystery series worth 4-1/2 stars

Murder on Marble Row by Victoria Thompson is the sixth installment in the Gaslight Mystery series starring midwife Sarah Brandt and Detective Sergeant Frank Malloy. While not as strong as the last entry, this is still a fascinating mystery. This time Malloy is ordered by Police Comissioner Teddy Roosevelt to look into the bombing of a wealthy industrialist, Gregory Van Dyke. Sarah, as usual, ends up helping with the investigation, and the two are pulled in two directions: towards the suspected anarchists and the tawdry family feuds that were hidden behind the marble facade of the victim's house. The last book focused heavily on the relationship between Frank and Sarah. This book introduces Frank to Sarah's family and the high society she came from. Thompson writes highly charged dialogue between the two that is realistic and on occasion humorous. This is currently one of my favorite series.