The title may be Bridge of Sighs, but don't expect any location shots of Venice in this Invincible Studios cheapie. Heroine Dorothy Tree tries to protect her brother by confessing to a murder that her sibling might have committed. DA Onslow Stevens is prepared to prosecute to the fullest extent of the law, until he senses that Tree is hiding something. Stevens turns amateur sleuth to ferret out the truth. Jack LaRue is around and about to provide his usual sneering menace.