The Face in the Mirror

Twins at birth, frenemies as teens, enemies as adults. Marianne and Marge live very different lives until a freak accident results in identity switch and Marge assumes Marianne's life, until she finds out someone wants her late father's casino and is willing to kill Marianne to get it. Since Marianne is temporarily incapacitated, Marge must find a way to save the family fortune and trap the perpetrators without being detected as an imposter.