Books 1-10
Books 11-20
21. Scott Alan Woodard: I, Davros: Part 4 — Guilt
22. Lance Parkin: Davros
23. Nicholas Briggs: The Davros Mission
24. Scott Alan Woodard: The Juggernauts
25. Joseph Lidster: Terror Firma
26. Keith Roberts: Pavane

27. Fred Hoyle: The Black Cloud (1957; this paperback edition 1959)
Astronomers discover something blotting out the stars and perturbing the orbits of the outer planets. They soon find out that it is a gigantic interstellar gas cloud, and it's heading straight for the Sun. Amidst the chaos caused by the Cloud blocking the sunlight, the scientific team makes a startling discovery.
A couple of chapters at the beginning are slightly interesting, towards the end things start to pick up, but the middle two thirds of the book are as wooden as to be nearly unreadable. No doubt the science, especially the bloody mathematical formulae, is reasonably accurate, but that doesn't help; quite the opposite in fact. Even the early (and to my mind much and partly unjustly maligned) Asimov wrote better characters than this, and the really interesting parts (the Cloud's direct influence on Earth's climate and the resulting impact on humanity!) are just skimmed over in ten pages, which also include more of the scientists' bickering among themselves and with politicians (who are, without exception, described as morons).
If you're only going to read one of the "classic" SF novels this year, pick something other than this.