I need book recommendations about Adi Shankaracharya and Advaita Vedanta for in depth study and understanding.

I am an agnostic coming from a Hindu background. Lately I've been feeling that I haven't really explored Hinduism in its entirety especially when it comes to Advaita Vedanta. I am aware of Adi Shankaracharya and his teachings but my understanding of them are rudimentary at best. However Hindi is not my mother tongue so I have depend on english translations. Please recommend me books that go very deep into the Advaita philosophy and its history with reliable and accurate English translation.