The following have proved useful to me as introductions-
'The magic furnace- the search for the origin of atoms' by Marcus Chown
'Fusion, the energy of the universe' by Garry McCracken and Peter Stott (deals mainly with the specifics of fusion reactors but has useful information regarding nucleosynthesis and other phenomena relating to the fusion process)
I recently bought 'Particle astophysics' by Donald Perkins (though leaning heavily on the maths side, is full of useful information, regardless of whether or not you have an A level in maths, and touches on subjects such as dark matter, dark energy, the expanding universe and star formation).
I've also started reading 'the extravagant universe- exploding stars, dark energy and the accelerating cosmos' by Robert Kirshner and while this isn't necessarily an academic book, it's well written and informative.
regards
Steve