In the bustling heart of Sydney, where the iconic harbour ferry connects the city's shores, Detective Sergeant Natalie Campbell is called to investigate when a body is pulled from the water - an apparent suicide that doesn't add up.

What begins as a straightforward drowning soon reveals something far darker lurking beneath the surface of Sydney's corporate world. When the victim is identified as David Garton, a quiet accountant whose meticulous nature led him to discover financial irregularities at his shipping company, Natalie must navigate both the complex currents of Sydney Harbour and the murky waters of international crime.

As the investigation intensifies, Natalie uncovers connections between Garton's death and a sophisticated smuggling operation with tentacles reaching into government agencies. With corruption threatening the investigation from within, each step closer to the truth puts Natalie in increasing danger.

The glittering Sydney skyline hides a pressure cooker of motives and deadly ambition where powerful people will kill to protect their secrets. But in a city where appearances are everything, some truths refuse to stay submerged.

Natalie must rely on her instincts and a handful of trusted colleagues to expose the killer before more bodies wash ashore, all while confronting a conspiracy that threatens the very foundations of justice in Australia.