This is an entertaining murder/mayhem action book, the strength of which was in the scientific research that had gone into it. The hopeless romantic Doctor Bacci creates a drug which can stimulate true love by tampering with the face recognition DNA and other areas of the brain. The science is very good, viral vectors are used to transmit the new DNA and it explains how the new DNA gets past the brain's 'firewall'. All very interesting stuff. What the Doctor doesn't realise is that true love can control people and the opportunities for abuse are endless.