We can learn frightening truths from things that have washed up on the beach…

Initially, Alexa Glock’s first case as a traveling forensic investigator seems straightforward - her expertise in teeth helps her identify the skeletal remains of a hunter found on the remote Stewart Island in New Zealand. But when she realises the bullet lodged in his skull was not self-inflicted and a second, shark-ravaged body washes up on Ringaringa Beach, it’s clear that something is off.

The disturbing sight confirms what locals have hashed out in the pub: shark cage diving, lucrative for owners and popular with tourists, has changed the great white sharks’ behaviour, turning them into man-eaters. Tensions between cagers and locals mount as Alexa dives into the harrowing case. And while measuring bite patterns, she makes a shocking discovery that just might lead her to the man responsible for both murders.