Volume 5

Two different covers, but both are the paperback of The Captive and The Fugitive, Volume V (vol 5), Modern Library edition, by 

ISBN   0375753117   or   9780375753114

You can order from Barnes & Noble  or Books-a-Million or these  independents or half.com or anyplace HERE. Be careful at Amazon,  where several editions are bunched together. 

<<== This is the hardcover, which has become hard to find & expensive.Publication date = 1993.

ISBN   0679424776  or  9780679424772

Here's your kindle edition and your Nook edition

Do NOT buy if it says 
"Edited by Christopher Prendergast."
That's the newer edition.