Reading recommendation

Many of you here know that I am not a religious person but I have an open mind. Sometimes I call myself a “hopeful”. I was educated for 16 years in Catholic institutions. Over the years I have read the Bible, long ago, cover to cover; Summa Theologica, Summa contra Gentiles and several works of Teilhard de Chardin. How’s that for diversity.

Anyway, what I am looking for is a good book or books on the historical records of Jesus. What do we really know from sources other than the Bible and historical evidence relating to the New Testament.

Thanks for any advice.