The Wagons Rolls At Night 1941. Humphrey Bogart, Joan Leslie, Sylvia Sidney, Eddie Albert An escaped circus lion provides the impetus for the meeting of carnival owner Nick Coster (Humphrey Bogart) and Matt Varney (Eddie Albert), a small-town man who suddenly becomes a lion tamer when he manages to subdue the big cat. While acclimating to carnival life, Matt begins a romance with Nick's sister, Mary (Joan Leslie), causing tension between Matt and Nick. The latter must also juggle his stormy relationship with glamorous circus star Flo Lorraine (Sylvia Sidney).