There must be absolute space because what? Explanation or a book that explains it better would be appreciated.
On further thought, if you are looking at it from some sort of metaphysical/(pseudo?) scientific perspective, absolute space is a little bit contradictory. To take one thing as "absolute," it must have an inherent unconditional existence, not relative to anything else. However, within the confines of anything "space," you inevitably get into relative notions.
Newton in Prinicpa
describes space as infinitive, eternal, isotropic continuum, independent of the mind (though not a-posteriori derived), and most importantly, not affect things and not have things affect it.
Leibniz describes space in terms of a plenum, filled to the brim with all forms of monads (those which reflect the world) as well as the primary perception of the dominant monad (that which reflects the world most accurately). There is no empty space in Leibniz's conception
Kant would say that though we conceive objects, they are only as far as the imagination goes. Objects in turn are non-identical because they inhabit different parts of space. Essentially, space cannot have two unrelated sections of space (spatial relations).
Einstein would probably say that under the terms of special relativity theory, for two events distant from each other in given space, the distance apart in time will vary with the frame of reference we have. So our relation to one may be simultaneous compared to the 24 hours apart further in time. But even in this, the variance in temporal difference is not independent of spatial difference.
Newton points out perhaps some valid fundamentals but elaborations determine relativity, which seems to be contradictory. But anyway, you may like these books;
* The Shape of Space
by G. Nerlich.
* Matter, Space, Motion
by R. Sorabji
* Travels in Four Dimensions: The Enigmas of Space and Time
by R. Le Poidevin