Everyman’s Talmud Abraham Cohen This is a very good overview of the basic theological and philosophical components of the Talmud. If you’re interested in studying the Talmud but don’t know where to start, this is one of the best starting points I have found.
Jewish Worship Abraham Millgram This is a great overview of the development of Jewish worship throughout the ages, specifically the development of the Siddur. This is the best source I have found on the historical background and sentimental outgrowth of the Siddur from the prayers of Israel. Highly recommended reading.