The Judge Dee series, historical mysteries/procedurals set in China during the Tang dynasty and based on a real-life judge. They are written by a Dutchman named Robert Van Gulik who made a lifelong study of China and Chinese culture, and lived there for many years... they're classics of the historical mystery genre. The descriptions of criminal trials are particularly interesting. Highly recommended. 

The Midnight, Texas series by Charlaine Harris. Southern goth (her specialty, apparently; she's better known for the Sookie Stackhouse mysteries, which I have not read). These are set in the town of Midnight, Texas, literally a wide spot in the road. Populated by a vampire, a witch, a psychic, a couple of angels... you get the idea. I'm not big on the supernatural mystery genre but these are pretty good. 

The Miss Julia series, by Ann B. Ross. Set in a small North Carolina town, Miss Julia is a recent widow who one day is confronted with her late husband's illegitimate child. As a good Presbyterian and one of the most proper ladies in town, this is a bitter pill for her to swallow but in true Southern lady fashion she deals with the issue and winds up taking the boy and his mother into her home. Julia is tough as nails and not always the kindest person, but the way she bonds with her husband's son is quite believable and I love the scenes with the two of them. The town manages to hide quite a few secrets, financial and otherwise, and Miss Julia goes about ferreting them out. 

The Shadow Walker, by Michael Walters, is (I believe) the first of a series featuring a Mongolian detective. It's a police procedural dealing with a serial killer. As one of the victims is a British national, a Chief Inspector from Scotland Yard is sent to assist with the investigation - the story is told from his point of view. I run hot and cold on procedurals, especially when serial killers are involved. I'm not a fan of violence porn. But here the focus is on Mongolia, a country focusing on modernization and moving out of the shadow of China, and it's really interesting. 

While we're on the subject, if you like procedurals an old but good series is the Gideon series featuring Commander George Gideon of Scotland Yard. The series is written by J.J. Marric, which I believe is a pseudonym. They were published from the 1950s to the 1970s. Each book interweaves several crimes taking place in London, either in the planning stage or in progress, from a petty crook who's knocking off stores to a man plotting to kill his wife for the insurance money. Gideon holds an administrative role, so does not investigate all the crimes himself; but you see him pulling the strings, sending out his subordinates and discussing the cases with them. The books take place in real time, over a day or a week or so. They're fairly interchangeable, so you don't have to read them in order. Definitely worth a look. 

Cozy series can be a mixed bag. There are way too many knitting/embroidery/bake shop/etc mysteries out there and a lot of them are really bland, with semigeneric main characters, or just badly written. However a series I've really enjoyed is the Noodle Shop Mysteries by Vivien Chien. Set in Cleveland in the Chinese-American community, Lana Lee is in her twenties and the manager of her family's noodle restaurant set in a large Asian shopping plaza. Who knew the death rate at the mall could be so high? But the characters are well-drawn and likable, and I can't stop reading these books. Also, the characters evolve from book to book, which is an important part of any series for me. This way you get a story arc that extends over several books and really makes the series more believable.

Lastly I'll recommend an urban fantasy noir series, the Nightside series by Simon R Green. They are set in the Nightside, part of modern day London. In the Nightside it is always three in the morning, the sun never shines, and anything goes. You can gamble, go to a bar that specializes in sadomasochism, run into a Greek god or two (or scarier things), get yourself a killer for hire. John Taylor is your classic trenchcoated detective with a murky background; his father is human, and no one seems to know who or what his mother is (was?). I've read the first several books in the series and she hasn't made an appearance yet. The series is leavened with humor and John's "gift" (he can find things with his mind) is well handled. He has to be careful how he uses the gift, because it can be used to track him and a lot of supernatural bad guys are after him. 

And then there was that one series about a semiretired librarian who solves crimes in his home town... with a cat. Oh, all right. It's the Cat in the Stacks series, and it is somewhat flawed (IMHO) but readable enough. I've read three or four in the series but it is beginning to get a little tiresome for a few reasons. The narrator is a widower who moved back to Athena, Mississippi from Houston after his wife passed away. He is a pleasant fellow, but I am finding him somewhat bland; many of the secondary characters are more interesting, and that isn't good for the series. Our narrator works in tandem with the official detective of the city police, the only black woman on the police force, and it's implied that she has to take some crap from her co-workers; but, as with so much in this series, the details are never spelled out. Their initial interaction is prickly but they get along better over the course of the series. I'd like to see more of her and less of the narrator. The cat is Diesel, a Maine Coon cat which he takes everywhere with him, and of course everyone adores the cat. I wish I had a dime for every time a character says "What kind of cat is that?" or "I swear that cat understands everything you say!" It's that kind of series.

Oh, well, it passes the time. (As has this blog post.) Mystery series are a great deal of fun, in most cases, and if you do a little research you can find one that will suit you. Happy reading, and if you have a series you would recommend be sure to let me know.