Issues 13 to 20, plus Casey Jones, April O'Neil, Fugitoid, Krang and Baxter Stockman Macro-Series, but most importantly the 4 issues of the magnificent Secret History Of The Foot Clan.The main series focus on the Krang versus Neutrino arc, which is nicely written but poorly drawn.The final four issues of the book are gorgeously drawn by Mateus Santoluco, and are, well... gorgeous.This IDW collection is a very nice hardcover, received in nice condition even here in France, and Master Splinter on the cover look as wise as ever, even a little cheeky. Anyways I plan to have them all, so this is a must have for me (the french edition is not nearly as good)