EXCLUSIVE: The deals are popping this week, and publishing is not immune. On the basis of a 4-page proposal, Alfred Knopf’s Sonny Mehta has paid $2.5 million for The Loneliness of Sonia and Sunny, the new novel by Kiran Desai. She’s the Booker Prize-winning author of The Inheritance of Loss. Robin Desser is the acquiring editor. This is the time for big book deals in the run up to the Frankfurt Book Fair, which gets underway in Germany next week. The publishing crowd was also buzzing over the fact that the deal was brokered by Andrew Wylie, who signed her 2 weeks ago from Inkwell Management. She left to join Wylie because he reps her partner, the Nobel Prize-winning novelist Orhan Pamuk.