David's life with his abominable relatives--hypochondriac Bernard, fault-finding Dot, self-righteous Ronald, and exasperating Astrid--abruptly changes when, in a fit of fury against his relatives, he creates a curse (appropriately fierce-sounding gibberish) and recites it in his back yard. Instead of something nasty for his relatives, however, he gets Luke: a mysterious, redheaded young man with an affinity for fire and a talent for troublemaking.
Luke's appearance is only the beginning of a bizarre set of events and peculiar visitations, from the malevolent Mr. Chew, to the preternaturally hearty Frys, to the twin ravens that constantly hang around David. The enigmatic Mr. Wedding has his own agenda, and some mystery hangs around the young man with the dragons. Before long, David finds himself moving between two worlds--his normal, everyday life with his relatives, and an unpredictable, mystical realm--and they both keep getting stranger.
As an admitted mythology addict, I loved "Eight Days of Luke." Figuring out, piece by piece, who the characters really are was half the fun in this book. The other half is Jones' delightful writing and the various complications that ensue as Luke (and what might be termed his set of bizarre relatives) enter into David's everyday life. Myth, folklore, and back-to-school shopping all combine in this novel; more impressively, they fit together naturally.
Everything I have ever read by Diana Wynne Jones has been excellent, and "Eight Days of Luke" was no disappointment. Even if you've never been one for mythology, read and enjoy!