The first of the Dalziel and Pascoe novels is not as complex or thoughtful as some of the later books in the series, but it's still an entertaining mystery that lays the foundations of the relationship between two very different men who together form a formidable detective team. Even this first book displays Hill's witty style and elegant prose, if not to the same high level as later books.
The book is based around the goings-on at a rugby club that may or may not be connected with the murder of the wife of one of the players, but no knowledge of the game is required to enjoy the book -- it's a study of the social interactions in such a venue rather than the sport itself. The main problem readers are likely to face is that the book was first published in 1970, and as such is recent enough not to be immediately obviously a period work, while still being old enough for the culture and mores to feel somewhat odd to the modern reader. It's important to be aware of the period when reading the book, as many of the potential motivations for the characters revolve around sexual jealousy and flouting of mores. Hill draws a detailed picture of life in a relatively small Yorkshire town in the 1970s, with its web of social obligations and friendships that can be exploited by both the police and those they're pursuing.
Not my favourite of the series, and the charcters aren't yet fully developed, but well worth reading both in its own right and as an introduction to the series.