This is an excellent volume discussing Plato's early and middle dialogues. It treats each dialogue individually by summarizing them and then discussing the key points. Guthrie's History of Philosophy is standard. I find it helpful in a different way than I did Giovanni Reale's series. Reale presents Plato's system, as it is interpreted through the middle and later dialogues with the "Unwritten Doctrines." Guthrie, on the other hand, shows Plato's development throughout the dialogues. This reflects the divide in scholarship (still ongoing) as to whether Plato's dialogues represent a development or is actually carefully crafted as a way of leading the student toward wisdom. Ultimately, I find the discussions in this book less helpful than Reale's and felt like he could have went into more depth in certain areas and less depth in others. But this is mostly based off of my interests. This is still a worthwhile series.