Saints,
This book is mentioned in Josef Tson's video series on "difficult times" it is a recommend book, he suffered under persecution in communist romania. It is at a cost-value price of $11 for a 500 page book!
Suffering, Martyrdom, and Rewards in Heaven
http://www.amazon.com/Suffering-Martyrdom-Rewards-Heaven-Iosef/dp/0761808337
The first systematic study of suffering, martyrdom, and rewards in heaven, this book offers a comprehensive survey of these ideas through biblical and historical investigation from the time of the writing of the book of Job to the present. Suffering and martyrdom for the faith are always accompanied in the biblical literature with the promise of great rewards in heaven. However, the Christian theology has never presented a comprehsensive treatment of this subject. For the Protestant ideology especially, it was always difficult if not impossible to integrate logically the concept of rewards into a system of grace and faith alone. This book, for the first time, presents a biblical and reasonable interpretation of the rewards in heaven and advocates close attention to God's original purpose for the creation of man as explanation for the complex issue of suffering and martyrdom.
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this is the video series he mentions the book:
Living In Union with Christ In Dangerous Times - Part 1 by Josef Tson
https://www.sermonindex.net/modules/myvideo/photo.php?lid=4919
Living In Union with Christ In Dangerous Times - Part 2 by Josef Tson
https://www.sermonindex.net/modules/myvideo/photo.php?lid=4917
Living In Union with Christ In Dangerous Times - Part 3 by Josef Tson
https://www.sermonindex.net/modules/myvideo/photo.php?lid=4918