Depends on the book. Experts vs the Sicilian is great, but I could not endure the Sveshnikov book by Aagaard.
Aagaard´s books
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I want a good middlegame book to put up positions before going to bed.
Was thinking of practical chess defence and attacking manual.
Attacking Manual is very good, the thing I like about it is that it's very heavy on the prose with explanations after almost every move. It reminds me of Nunn's "Understanding Chess Move by Move" in that sense.
You can download a pdf sample here to get a taste: http://www.ukgamesshop.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=chnew898&Category_Code=
I would imagine the Defence book is much the same
How are the book of Aagaard?
I've been thinking of getting practical chess defence of him.
Are they any good? Insttuctive wise I mean.