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.

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.

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 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?