Death by Sugar by Helen Goltz

Private investigator, Jesse Clarke, thought sugar was such a friendly substance, until it appeared in two of her cases for all the wrong reasons. Traces of sugar were connected to a bomb that blew up her client’s Mercedes. Was the bomb meant to kill or was it just a warning of what was to come? And could sugar have duped the immune system of a client’s mother over thirty years ago, resulting in death? Juggling the two cases—one in the present and one in the past—Jesse finds herself talking to the living and the dead to get results.