One of this blog's most popular posts is "If You Like Agatha Christie mysteries, try these authors", so for you Christie and cozy mystery fans, here are more authors to try:
Martha Grimes - English pub name series featuring Scotland Yard's Inspector Jury. Read the early ones in the series.
Simon Brett - the Fethering series, set in a village in England, is very light, but the plots are convincingly complicated and well-paced.
Carola Dunn - Daisy Dalrymple series, Daisy is a liberated woman jounalist and sleuth in 1920's England.
Nancy Atherton - the premise of the Aunt Dimity series, that Lori Shepherd's dead aunt communicates through her journal to help Lori solve crimes, is silly, but the mysteries are good anyway if you can get past the ghost-written journal.
Rhys Bowen - the Evan Evans series set in Wales is mostly enjoyable because of the beautiful setting, although the writing and mysteries are satisfying also.
Hazel Holt - Mrs. Mallory series, English village sleuth in classic cozy format.
My favorite: M.C. Beaton - the Hamish MacBeth series and the Agatha Raisin series. The earlier titles tend to be better in my opinion; the later ones are a fix for devoted fans only. Hamish is the clever, but lazy, Highland village constable; Agatha is the cranky middle-aged Cotswold's detective.