Lisa sneaks into a convent to retrieve Maggie, who was mistakenly taken in by the nuns. While there, she stumbles upon a set of mysterious clues pointing to a hidden gem in Springfield. Teaming up with local history enthusiasts Principal Skinner and Comic Book Guy, Lisa embarks on a quest to locate the elusive treasure. However, the Springfield Freemasons are also pursuing the jewel, forcing Lisa to hurry and secure both the gemstone and her sister’s safe return before it's too late.
Show
The Simpsons
Episode
S20E13
Air Date
Mar 15, 2009
Season 20 Episodes
S20E01
Sex, Pies and Idiot Scrapes
S20E02
Lost Verizon
S20E03
Double, Double, Boy in Trouble
S20E04
Treehouse of Horror XIX
S20E05
Dangerous Curves
S20E06
Homer and Lisa Exchange Cross Words
S20E07
Mypods and Boomsticks
S20E08
The Burns and the Bees
S20E09
Lisa the Drama Queen
S20E10
Take My Life, Please
S20E11
How the Test Was Won
S20E12
No Loan Again, Naturally
S20E13
Gone Maggie Gone
S20E14
In the Name of the Grandfather
S20E15
Wedding for Disaster
S20E16
Eeny Teeny Maya Moe
S20E17
The Good, the Sad and the Drugly
S20E18
Father Knows Worst
S20E19
Waverly Hills 9-0-2-1-D'oh
S20E20
Four Great Women and a Manicure
S20E21
Coming to Homerica