Finally , when Sly snuck onto Arpeggio 's blimp , It was revealed that Neyla had really been working for Arpeggio all along - but she later double - crosses him like everyone else.she then fuses herself with Clockwerk , kills Arpeggio , and becomes Clock - La .
Finally , when Sly snuck onto Arpeggio 's blimp , It was revealed that Neyla had really been working for Arpeggio all along - but Clockwerk took control for the last time and made her double - crossed him like everyone else . 
 Under Clockwerk 's control : she fuses herself with Clockwerk , kills Arpeggio , and becomes Clock - La .