R. F. R. Gardner, Healing Miracles: A Doctor Investigates (Darton, Longman and Todd 1986).
I think the book is more useful for its documentation than its theological analysis. The author cites an impressive number of well-attested case-studies.
Here’s some background info on the author's qualifications:
R. F. R. Gardner is a Fellow of the Royal College of Obstetricians and Gynaecologists, and of the Association of Surgeons in East Africa. He has served as Examiner to the University of Newcastle-upon-Tyne, as Vice-President of the North of England Obstetric and Gynaecological Society, and as President of the Newcastle and Northern Counties Medical Society. In 1958 he was ordained to the Christian Ministry by the United Free Church of Scotland, and he is a member of the executive committee of the Christian Medical Fellowship.