Paul Auster's 1992 novel Leviathan? No.
Shea and Wilson's 1975 novel Leviathan? No. It's third in the Illuminatus trilogy.
Scott Westerfeld's 2009 novel Leviathan? Maybe. The book was left kind of open ended and there is another novel due to come out as part of a Leviathan series in late 2010.
I don't think you mean the 1651 book by philosophy book by Thomas Hobbes. I'm not sure how a philosophy book would have a "sequel", per se.
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There is no sequel (or even talk of one) to date but there is a badly adapted movie
I do not think that there is a sequel to Hoot. It's end is pretty conclusive. Though there is another book by Carl Haaisen called Flush.
There is not a sequel to Alyzon Whitestarr. Author Isobelle Carmody said in an interview that she would consider writing a sequel if there was enough fan support.
It's called a sequel.
The Digging Leviathan has 276 pages.