As has been mentioned already, Elmore Leonard is excellent - if you haven't watched the Justified TV series, featuring one of his characters (US Marshall Raylan Givens) then you have missed one of the best series in the last 20 years.
Would also agree on Dennis Lehane, particularly his Kenzie/Gennaro series, although Mystic River is also a fantastic read. Robert Crais's Cole/Pike series is superb and for a bit of Scandanavian crime, Jo Nesbo's Harry Hole series is well worth a read.
Finally, William McIlvanney's books featuring tough Glasgow detective Jack Laidlaw are very good. There are only 3 of these.
Would also agree on Dennis Lehane, particularly his Kenzie/Gennaro series, although Mystic River is also a fantastic read. Robert Crais's Cole/Pike series is superb and for a bit of Scandanavian crime, Jo Nesbo's Harry Hole series is well worth a read.
Finally, William McIlvanney's books featuring tough Glasgow detective Jack Laidlaw are very good. There are only 3 of these.
I had no idea what her books would be like 