London 1884. Victorian industrialist Alexander Glenville is a man with many secrets. Fleet Street reporter Penny Green is tasked with working undercover as a maid in his home, but tragedy strikes when Glenville's daughter is poisoned. Penny's insider knowledge is crucial for Scotland Yard's murder investigation, but someone in the Glenville household already suspects that she's more than just a servant. Can Penny and Inspector James Blakely solve the mystery before Penny's cover is blown?