Let me recommend, Visions Beyond the Veil by H. A. Baker. This true story is an easy read and a page turner.
Orphaned, forgotten, uneducated children living in remote China are taken in by missionaries, the Bakers. While living at the Adullam House, the children fall under the power of the Holy Spirit and have visions and encounters of heaven and hell.
The author used scriptures to explain the mysteries the children encountered. For believers, an amazing journey awaits you. For the pre-believer I hope you take this book to heart and ponder what you have read.