Horticus UK (United Kingdom): 1

Unknown (2011) is an action-thriller film directed by Jaume Collet-Serra. The story follows Martin Harris and his wife Liz as they arrive in Berlin for a biotechnology summit. Upon arriving at their hotel, Harris realizes he has left his briefcase at the airport and hastily takes a taxi to retrieve it. However, the taxi is involved in an accident and ends up in the Spree, knocking Harris unconscious. Thankfully, the driver rescues him but quickly disappears from the scene. After four days in a coma, Harris regains consciousness at a hospital and rushes back to his hotel, only to find Liz with another man claiming to be ...