I should add ...

The Ruby Red trilogy I mentioned below of course also heavily features time-travelling.

But while it's a very sweet story, and full of interesting adventure, I must say that the whole time-travel/paradox/risks thereof-angle is hardly mentioned at all, and the technique behind the travelling is rather convoluted, which makes it difficult to follow.

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Is it not strange that sheeps' guts should hale souls out of men's bodies?