Watch The Postcard Killings (2020) online

The Postcard Killings is a 2020 British-American mystery crime drama film directed by Danis Tanović and starring Jeffrey Dean Morgan, Famke Janssen and Cush Jumbo. It is based on the 2010 novel The Postcard Killers by James Patterson and Liza Marklund.
Jacob Kanon, a New York detective, investigates the death of his daughter who was murdered while on her honeymoon; he recruits the help of Scandinavian journalist Dessie Lombard when other couples throughout Europe suffer a similar fate.

The movie opens with someone killing a young couple. It turns out to be Jacob Kanon's daughter and her husband who are in London on their honeymoon. He went to London to identify the bodies of his daughter and her new husband at the morgue.

After that Kanon starts investigating on who's the killer and moves to other European cities as the killer doesn't stop. With the help of a Scandinavian journalist and a German policeman he discovers the truth and understands what's going on.