In order to make searching demanding task, Nolan asked for physicist Kip Thorne to become part of the movie crew Thorne, an expert on black holes and wormholes, provided his math knowledge for movie specialists to turn it into the great special effects.
The Science of Interstellar written by Thorne himself, with an introduction made by Christopher Nolan, story is about the physicist experiences while he worked as the science adviser on the Nolan movie, while in the remaining part Thorne Introduces science Which lies behind the Interstellar Movie Which will be very interesting to Those Who enjoyed the movie.
Besides other topics Thorne speaks about Gravity & Time dilation, food and oxygen shortage on planet Earth, spacecraft Endurance, physics of black holes and wormholes, and many others.
Given there are lots of spoilers within the book covers if you plan to watch movie My suggestion would be to first do that, in order not to spoil the fun.
The Science of Interstellar is easy to read and understandable guide to the science knowledge used during making of Interstellar movie, and as search can be mostly recommended as a continuation of enjoyment after seeing the visually spectacular movie.