What book did James Rusk, Jr. write that caused the F.B.I. to hold him with suspicion?

The Black Abductor. About the Patty Hearst case.

http://books.google.com/books?id=s8d0F4pCFLYC&pg=PA27&lpg=PA27&dq=james+rusk+jr.+black+abductor&source=bl&ots=JN65ZW2tOd&sig=dIa5sIy25M3GJtrYrVmgG-JSge8&hl=en&ei=TLFRTPXJDZK-sQPagpmYAQ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBUQ6AEwAA#v=onepage&q=james%20rusk%20jr.%20black%20abductor&f=false

The FBI believed that science fiction writer James Rusk Jr. might be the person behind the pseudonym Harrison James, the 'author' of Black Abductor - written in 1972, two years before Patty Hearst's adbuction. The novel was based around the abduction by terrorists of a rich heiress.

Scroll down two-thirds of the way to section titled Victim or Fugitive:

http://craneshot.blogspot.com/2009_07_01_archive.html