I've read all of John Grisham's stuff, but he seems to be going off the boil now. Ludlums stuff was good, so was Michener's.
OK, that's the American contingent deal with!
Some Brit authors worth reading:
Neville Shute............On the beach. Beyond the black stump. An old captivity.
Nicholas Montserrat.... Story of Esther Costello. The master mariner.
Stan Barstow........A kind of loving. The watchers on the shore.
Caro Fraser.........Judicial whispers + lots of excellent novels about the UK legal system.
There's loads more, but that's enough for now.
Englishman.