Mara Graf (Claudia Michelsen), a well-respected German geologist and tsunami expert, has been assigned the task of installing seismological measurement equipment at the bottom of Urnersee by the Swiss Seismological Service. The institute has long been observing seismic activity in Lake Lucerne. Another landslide upside of the “Axenstrasse” renders additional investigations at the lake floor necessary. During one of the dives, Mara’s life and diving partner, Gian Wyss (Lorenz Nufer), dies under mysterious circumstances. Instead of receiving support from the authorities, Mara comes increasingly under suspicion during the course of the police investigation — suspicion of being responsible for and even having wanted Gian’s death. Backed into a corner and without any allies, Mara embarks on a single-handed search for the truth. Thanks to her persistence, she eventually wins the support of army captain Sebastian Scherrer (Pasquale Aleardi).

(...) the outstanding German actress Claudia Michelsen, who carries this film between the edge of despair and the heights of a fighting spirit. She touchingly conveys how lonely one can be (...)
NZZ ONLINE (NEUE ZÜRCHER ZEITUNG)