Did Cecile possibly survive
I know we're supposed to assume that Cecile died in the final scene where she is sinking into the quicksand. However it could be that Watson, Holmes and Henry could have gotten there in time to pull her out or she could have pulled herself out. Then I wonder if perhaps Henry might have decided not to press charges against her. He had fallen in love with her and he could have convinced himself that she had been brainwashed by her father in the plot and didn't know what she was doing and now they could start fresh.