Funny you ask; I'd been thinking about titles and wasn't coming up with much. I guess I'm lukewarm on 'The Mystery...' but have to admit about the only other thing I could think of was 'The Ball Players,' as that would cover both Sean and Lenny and give a misdirect that they were the same person. 

Sorry I'm not much help here. Titles are important. Sometimes I find them easy, sometimes not. Let me know what you decide.

Best Regards,

Nyanidoc