How did Teresa drown in the book deep and dark dangerous?

Teresa, the young girl who tragically drowns in the book "Deep and Dark Dangerous" by Peter James, doesn't actually drown in the book. She dies of hypothermia after falling into the cold sea.

Here's the breakdown:

* Teresa, a young girl playing on a beach, gets caught in a rip current and swept away from the shore.

* The cold water of the sea shocks her system, leading to rapid hypothermia.

* Teresa's body becomes numb, making it impossible for her to swim back to shore.

* She eventually loses consciousness and dies from hypothermia.

The book focuses on Detective Roy Grace's investigation into Teresa's disappearance and the events leading up to her death. While the death is initially perceived as a drowning, the investigation reveals the truth about her death.

So, Teresa's death is not due to drowning but rather to hypothermia caused by the cold water.