See Youtube video book trailer of crime fiction novel Presumed Dead by Martin Knox at this link:
Jane Kenwood is a feisty independent on a city council rife with skulduggery. When there is to be a vote on a casino project that she has been outspoken in opposing in a hung parliament, she disappears mysteriously.
Dr Phillip Keane, her partner, is a forensic scientist and sets up a think tank of her friends to investigate, with help from the police. The story has forensic science to savour and reveals corruption in partisan politics that disable governments.
The friends search systematically and find evidence of causal links between the perpetrators’ motives, suspects’ characteristics, crime scenes and the victim’s condition. Hypotheses reconstructing the heinous crime are related by an Euler walk, a theory of the crime able to convict, keeping you guessing until the dramatic final dénouement.