Phineas and bart's revenge

Phineas learns the truth

Phineas visits bart in the Springfield jail and bart angrily yells 'you! You're the one who killed my sister lisa!. Phineas replies 'my bad but Jessica told me that  doofenshmirtz killed my girlfriend Isabella.' Bart replies "you were had, phineas  Jessica set up the whole thing.' When they're collecting evidence against Jessica they find out from gretchen that Jessica attacked her and stole her fireside girl cookies.  They find fireside girl cookie crumbs leading to a used cage and a tank with Isabella's pink hairbow and blood red water. Part 2 they will put Jessica on trial for setting everything up.