Skyron, several collections I can think of are:
The Cadfael series by Ellis Peters
Some of the most enjoyable reading I’ve ever run across.
http://en.wikipedia.org/wiki/Cadfael
The Cat Who books by Lillian Jackson Braun.
A total of some 20 or so books. It is lightweight fun reading.
http://en.wikipedia.org/wiki/Cat_Who_series
The Navajo tribal police mystery series by Tony Hillerman
Not heavy literature but good reading with a glimpse into a different culture.
http://en.wikipedia.org/wiki/Tony_hillerman
The series featuring the British police detective Adam Dagliesh by the author P.D. James. She also has numerous other books.
http://www.randomhouse.com/features/pdjames/library.html
William X. Kienzle was the author of twenty-four crime fiction/mystery novels featuring Father Robert Koesler, a Catholic priest who doubles as a detective.
http://en.wikipedia.org/wiki/William_Kienzle
A series of murder mysteries set in Washington D.C. with a recurring cast of regular characters written by Margaret Truman.
http://en.wikipedia.org/wiki/Margaret_Truman
Several related series of clean thriller novels by Clive Cussler.
http://en.wikipedia.org/wiki/Clive_Cussler
There is also a very popular author Laurell K. Hamilton who has written some 20 books in a fantasy series about vampires. She lives here in St. Louis. I’ve met her several times as we have mutual friends. She has a huge international following. I cannot personally vouch for her books as it is a genre I simply do not read despite the slight personal connection to her. But I do know she is widely read.
http://en.wikipedia.org/wiki/Laurell_K._Hamilton