Paramount will release the film on April 10, 2015.
McNamara will direct the film, which stars Pierce Brosnan, William Hurt, Benjamin Walker, Kaya Scodelario, Pablo Schreiber and Fan Bingbing.
The story follows King Louis XIV’s quest for immortality that leads him to capture and steal the life force of a mermaid. But Louis’ plans are complicated by his daughter, who befriends the creature and defies the most powerful monarch on earth.
The film is produced by Bill Mechanic, Hong Pang, Wei Han, Paul Currie, McNamara and David Brookwell.
International sales are being handled by Good Universe.