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Accused of fraud, Ivan Lausman aims to end it all by driving his car into a river. When he's washed up 10km downstream, alive and well, the Aquarians know he's a land-lubber with a residual Aqua gene.

Inspector Jara and Trpelka, the officer assisting her, investigate what happened to Ivan Lausman, but they are unaware that the nixes, or Water People, are also after him and he has gone into hiding.

Lausman is enjoying nix life and Jara, who is trying to track him down, is humiliated when a picture of her quarry, taken by a tourist, appears in the paper. Trpelka nearly drowns during a stake-out.

Jara makes a breakthrough when she receives another set of photos. Lausman attends a nix history lesson by Dr Magda Mrackova and learns about the 'magic water' of Vysehrad lake, hidden beneath Prague.

Jara breaks into a boat belonging to Lausman's protectors Eduard and Johana, steals some strange food items and sends them off to the lab. Dr Jech is confused by the results of his tests on Lausman.

Eduard is determined to get to the truth about the magic water of Vysehrad and starts a petition to propose the 'coming out' of the nixes. Lausman plans a new venture in the bottled water industry.

The local nix boat dwellers are cynical about Eduard's revolutionary talk. Mr Sikorsky from the Fresh Water Alliance arrives in Prague to 'deal with' Lausman. Jara is removed from the investigation.

Eduard reveals he knows how to access the waters of Vysehrad. Magda meets in secret with Bishop Laska, who tells her that if Sikorsky fails to exterminate Lausman, it will be up to her to do the job.

Magda instructs that Lausman should be 'dried out', but when his test results confirm his exceptional genetic status, she tries to rescind the order. Eduard's closing in on the entrance to the waters.

Magda concocts a plan to convince Lausman to marry her, as she's now sure that he is the nixes' Messiah. Lausman and Robert are becoming increasingly concerned about Eduard and Johana's wellbeing.

Jara has lost interest in the nix case since being hypnotised by Magda. The bottled water scheme is jeopardised. The magic water is revealed to grant a youthful appearance, but there are side-effects.

A tank of algae is poured into the lake that supplies water to Prague, causing a humanitarian catastrophe. Jara is cured of her distraction, and Magda plots to become the next chairman of the council.

Magda tells Lausman she knows where the rest of the ancient scrolls are, but when he takes the bait and volunteers to retrieve them, peril awaits. Jara's hot on his heels, but will she arrive in time?