I really loved how The Mystery Guest gave us a glimpse into more of Molly's backstory, while continuing to develop the investigation into the death of author J.D. Grimthorpe. Molly the Maid is such a unique character whose voice is both at times insightful and humorous. I really hope more of Molly's adventures are on the way.
While you could read this book as a standalone, I would recommend reading The Maid first to have a greater appreciation for the characters, and quite simply because The Maid was just so good.
I received this book courtesy of the publisher through NetGalley in exchange for an honest review.