In this episode, a dead body forces Grampa to reveal his life as a private detective and the mystery of the disappearance of his partner.
At the cemetery where graves are being moved for new construction, they found a coffin containing two bodies and a business card for Grampa's detective agency.
She tests the business card using a forensics kit and finds type AB-negative blood on it.
In the present, Homer overhears this and thanks Grampa, who deduces that the dust is from phonebooks used for constructing the power plant.
[1] Jean also held a contest to give signed scripts to fans who guessed the answer correctly.
[3] Grace previously guest starred in the nineteenth season episode "The Debarted" as a different character.
[5] The episode earned a 0.26 rating and was watched by 0.98 million viewers, which was the most-watched show on Fox that night.
He liked the flashback setting but felt the plot involving a love triangle between Grampa and Mr. Burns seemed similar to the fifth season episode "Lady Bouvier's Lover".
[2] Nick Venable of CinemaBlend also thought it was not necessary to explain the gaps in plot or logic regarding Homer's job.