With their motto, "will solve any crime by dinner time," the Trenchcoat Twins, Mary-Kate and Ashley Olsen ("Full House"), are ready to tackle another fun-filled musical adventure mystery.With their motto, "will solve any crime by dinner time," the Trenchcoat Twins, Mary-Kate and Ashley Olsen ("Full House"), are ready to tackle another fun-filled musical adventure mystery.With their motto, "will solve any crime by dinner time," the Trenchcoat Twins, Mary-Kate and Ashley Olsen ("Full House"), are ready to tackle another fun-filled musical adventure mystery.