In general, I feel drawn to books written in or set between 1890 and 1930. When I saw The Osiris Ritual was set in 1902 and involved a mummy's curse (I like Egyptian themed novels) I thought I would be in for an enjoyable, exciting read... And I was, after a fashion.
The book is oddly compelling. It's extraordinarily well-written, apart from anachronisms in the dialogue, and rattles along at a break-neck pace. The car chase and race atop the roof tops were brilliant, and the ending was satisfying, setting up for the next book in the series. However, I did feel that Newbury jumps to conclusions far too readily. Considering he's an agent of the Queen, one would think he'd consider his theories more before racing off. And I thought Hobbes could have featured more. It was like 'The Sir Maurice Newbury Show, featuring Veronica Hobbes', rather than the two of them actually working together in any real sense.
The author gets the feel of the early 1900s just right, as the book deals nicely with the conflict between those who think progress through science is the way forward (nicely suggested by Newbury reading a book about Futurism) and those who think science is going too far (Hobbes has this point of view, hence why she does not like the steam-powered cars). William Ashford and Dr Fabian characterise questions of how far we should let science and technology progress without an ethical base - progress may have a price we do not wish to pay as a society. Newbury being addicted to laudanum was a nice touch, and dealt nicely with the theme of living a double life (a theme prominent in early twentieth century literature) - he's an agent of the crown, but also frequents opium dens, which he tries to keep a secret. The problem is, there are so many authors who have done these themes so much better - Herbert West in 'Herbert West - Reanimator' by H.P Lovecraft is a more convincing 'mad scientist' than Dr. Fabian, and Dr. Frankenstein is also more sympathetic.
So, the book is an enjoyable read, well-written, and has many contextual features of the early 1900s which set the scene quite nicely. There are many flaws though, in that Newbury doesn't make a particularly convincing investigator (Sherlock Holmes would never have jumped to conclusions as readily as Newbury does), and Hobbes seems surplus to requirement.