Black Waters. Tides of Maldon, #2

The wards are failing. And this time, Aidan Maldon is at the centre of the breach. As a Warden of the Abyssal Watch, Aidan knows the deep - the pulse of the magic, the signs of corruption, the cost of failure. So when sea witches strike near a weakening seal, he breaks protocol to save a life. That life is Wynter - a surface-dweller with strange magic the sea should reject. But the wards respond to her.
The deep doesn't. As ruined seals crack and void-tainted creatures rise, Aidan is forced into a role he never wanted: protector, guide, and defender of a woman whose magic could either restore the ocean's balance. or break it beyond repair. With the council watching and the sea turning against them, Aidan must decide where his loyalty lies-With the laws of the deep. Or with the one person who might save it.