That's right. It's a Project to save the princess. But who's the princess? That's right.. No one knows who the princess is .The princess will suceed the throne as she is found and saved. 

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Princess(n.) 1.  A woman member of a royal family other than the monarch, especially a daughter of a monarch.

2. A woman who is a ruler of principality.

3. A woman who is  a hederitary ruler ; A queen

4. The wife of a prince

5. A woman regarded as having the status or qualities of a princess.

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But this princess is completely ordinary. She's not that pretty or not that smart too. But that does not and never will change the fact that she is a princess.