Holger Kersten is known for his book Jesus Lived in India which was published about ten years ago and updated in 1994. I remember reading some of that book several years ago and being absolutely unimpressed by his so-called evidence that Jesus had traveled to India at some time. His new book The Jesus Conspiracy is a little more creditable, but not much. His main thesis is that the Vatican rigged the 1988 carbon dating test of the SHROUD OF TURIN to show a medieval date for the origin of the shroud. Kersten believes the SRHROUD to be the authentic burial cloth of Jesus, but that it shows that Jesus was still alive when he was taken from the cross (due to evidence of blood flow). So Kersten believes the Catholic Church wants to cover up the shroud's authenticity, therefore they rigged the carbon test, substituting cloth from a 13th Century knight's head-dress for the cloth from the shroud.
Actually, he does a pretty good job of pointing out the many irregularities and inconsistencies of the test, up to a point. Then he gets into a long and garbled account of his high-tech examination of the photos of the various shroud samples as compared with a photo of the shroud itself, where the cutting was done. He attempts to prove that the photo of the cloth sample that was received by the Oxford carbon-dating facility could not have been cut from the shroud, due to differences in the weave, etc. However, by examining the photos provided in the book (plates 12 and 14),I found several points of similarity--i.e., a raised thread at the same place on the cloth, etc.--convincing enough for me that the Oxford cloth was cut from the shroud.
Kersten provides a computer-enhanced overlay comparison in plates 27 and 28, but the Oxford photo has been printed with the negative reversed (!), making any real comparison impossible. I don't have a clue whether this was purposeful or an oversight.
As for the possibility of blood flowing from a dead body, this has been discussed in other books; for example The Crucified.
I thought of a half-baked theory that might explain the lengthy waffling of the Catholic Church before the carbon test: it gave them time to secretly carbon-test the shroud themselves, perhaps using various methods. When they discovered that that accelerator mass-specrtromotholomometry method gave a consistent medieval date, they allowed that method for the actual test. Perhaps the Church felt that there was too much emphasis on the SHROUD, and wanted the whole matter to die down a bit, whatever their beliefs about its authenticity. The Church is based on faith, after all, which is something not necessarily subject to scientific scrutiny.
Despite its many faults, The Jesus Conspiracy makes for some interesting reading--but take it with a grain of salt!