What book for DH for Christmas??? He loves Jasper Fforde, Robin Hobb, Tolkein, Grisham...

[Astrophe]

I'd love to get him started on something new - any suggestions?
TIA :)

Tom Holt? Neil Gaiman?

Game of Thrones series, if he likes Tolkein/Robin Hobb.

Terry Pratchett? Tad Williams? Guy Gavriel Kay?

Simon R Green - the Nightside series.
Riftwar - the first trilogy of Magician, Silverthorn, and A Darkness at Sethanon, and the Mara trilogy - Daughter of, Servant of, and Mistress of the Empire.
The ones he wrote later just aren't as good, but those six are fab. By Raymond E Feist.
John Scalzi - the Old Man's War series are good too, they're more "hard sci-fi" than fantasy but a cracking read.

Ben Aaronovitch's magic London coppers books are good. Second Neil Gaiman, Terry Pratchett (actually you can't go wrong with Good Omens, their collaboration) and Tom Holt.

Tad Williams- the Memory Sorrow and Thorn trilogy?

Stan Nicholls - Orcs (trilogy) or James Barclay - Chronicles of the Raven?