Is there a book about the economics of secession?
Discussion
Do you mean a specific secession (or attemp)? Or the concept in general?
The concept in general.
I donât know of any works on the economics of whole territories seceding. Closest I can think of is Benjamin Powellâs book The Economics of Immigration. It details the boon that would come from opening bordersâeffectively allowing people to secede individually. 
Maybe this is what youâre looking for: https://mises.org/library/breaking-away-case-secession-radical-decentralization-and-smaller-polities