""Two Sets of Unpublished Letters of Henry Martyn"" is a book that features letters written by the renowned missionary Henry Martyn. The letters were previously unpublished and were compiled by the author in 1883. The book is divided into two sets of letters, the first set containing correspondence between Martyn and his friend Charles Simeon, and the second set containing letters written to his sister. The letters offer insight into Martyn's personal...