This is a fairly slim book for the cost, but the content justifies this. Unlike some of Dunham's other books, this is really intended for an undergraduate rather than a school or A-level student, though I would recommend it to someone at college who is expecting to do a maths degree. Euler's works are not readily available and this book is one rare chance to see some fully worked proofs of Euler's. Luckily for me my university has Euler's "Opera Omnia" in its library, but even for us privaleged Euler fans, the great tomes are in all sorts of languages, (Latin, German, French &c). Take this opportunity and experience some well selected theorems with proofs belonging to Euler presented by Dunham in English and with informal commentary. I have worked through one or two of the proofs in "Euler, The Master Of Us All" in detail, ensuring that I followed every step, and the rewards are massive. I was so enthusiastic about one of the proofs that I tried to learn it off by heart, (and I think I succeeded short term, but I suspect I would need to revise it now). I am a pure mathematics enthusiast, (though I won't go into my philosophical uncertainties about today's frontiers), and this is what might be called elegant pure maths before all the big fish were caught, (Euler was himself a master fisherman, and could probably fish with a rod in both hands and undoubtedly knew every kind of knot).