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Este libro es, sin duda, el más interesante de todos.

Este libro es, sin duda, el más interesante de todos.
This book is, without a doubt, the most interesting of all.
From Lesson 548:Stressing and summing up (sin duda, en resumen)·Spanish (Spain)

Questions & Answers about Este libro es, sin duda, el más interesante de todos.

Why is there no accent on Este? I thought demonstratives sometimes needed them.
Este is a demonstrative adjective here because it comes right before the noun libro. Even if it were a pronoun standing alone to mean "this one", the Royal Spanish Academy updated the rules to state that the accent mark (éste) is no longer required unless there is a specific risk of ambiguity.
Why do we say sin duda instead of sin una duda to mean "without a doubt"?
In Spanish, the preposition sin (without) is almost always followed directly by the noun, dropping the indefinite article (un or una). Adding una here would sound unnatural to a native speaker, as sin duda is a fixed and very common expression.
In the phrase el más interesante de todos, what is the rule for using de?
When forming superlatives to express "the most" or "the least", Spanish uses the preposition de to define the group you are comparing the subject against. While it translates directly to "of" here, keep in mind that Spanish also uses de where English uses "in", such as el más interesante del mundo (the most interesting in the world).
How do we know todos refers to books and not people here?
Todos (all) agrees in gender and number with the masculine, plural noun it refers back to, which context tells us is los libros (the books). If the sentence were about feminine nouns like magazines (las revistas), it would change to todas.

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