Each stamp - there are se-tenant pairs of 1st class, £1.33 and £.152 - is fully captioned with the title of the work illustrated, but there is more to read in the small print - microtext and detail only revealed with an ultra-violet lamp.
For the £1.52 stamp illustrating The Body in the Library there appears to be text on the spines of the books lining the shelf beyond the chalk outline of the body. What that text reads is anybody's guess as we are not privy to the detail!

UPDATE 18 August
Incidentally, the Agatha Christie Birthday Celebrations in Torquay, also on 15 September includes a Royal Mail Special Stamps shop, and book signings (and probably first day cover and postcards signiings), and Sutherland (stamp designers) cleverly used the IST class Machin stamp on their invitation cards (see right).
Sutherland also designed the Charles Darwin, Royal Society, London Underground, Rescue at Sea, and Royal Shakespeare Company stamp sets.
It will be a nice 6-stamps issue! Thanks for the information! Catalin
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