I'm developing an adventure that is intended as a group's first adventure and will act as the reason that the team bands together and it'll present their first villain.

It is based on the premise that some seemingly random people are being killed around town and suited up as the heroes, with party costumes. It is intended for a PL9 group.

Does it sounds promising to you? What would you like to see on it that you find lacking on other adventures/modules?
P.S.: The idea is loosely based on Batman's "The Many Deaths of Batman", and being so, it's unoriginally named "The Many Deaths of [INSERT GROUP NAME HERE]". Any suggestions for names are also appreciated. :P
It'll be released by Harpia Games (probably their first product) on DriveThruRPG