A Quantum Murder: Greg Mandel Trilogy, cartea 2

Dr Edward Kitchener, a brilliant researcher into quantum cosmology, lies dead with his lungs spread out on either side of his open chest. Only a mercenary or professional killer could have breached the premier-grade security system--but why would a professional waste time in ritual slaughter?

Greg Mandel, psi-boosted ex-private eye, is enticed out of retirement to launch an investigation into a past which--according to Kitchener's theories--might never have happened.