The Long Goodbye by Raymond Chandler
Edwin of the Iron Shoes by Marcia Muller
the Anna Pigeon mysteries by Nevada Barr, beginning with Track of the Cat
the Anna Lee mysteries by Liza Cody, beginning with Dupe
the V.I. Warshawski mysteries by Sara Paretsky, beginning with Indemnity Only
For more readalikes, check out this list by Bettendorf Public Library.