The Lazarus Conundrum

In a world where the dead routinely return to life, the most shocking mystery is when someone doesn’t.
Detective Inspector Helen Ogilvy is called to the scene of a murder. A young woman named Trinity Brown has been shot in the chest, and she’s stayed dead.
The potential end to the zombie affliction should be a huge positive, but for a future UK teetering on the brink of becoming a police state, a country where healthcare has never been so well funded because lower mortality rates equal fewer zombies, the truth behind Trinity Brown’s non-resurrection has the potential to cause chaos, which is why a shadowy Government figure has persuaded Helen’s boss to keep a lid on what’s happened, at least for the moment.
Now Helen has two days to solve two mysteries. Who killed Trinity Brown, and why did she stay dead?