In An Instant (2015)
S01E21 Love Letters on the Rocks
Episode Overview
When Fred stumbles upon a love poem addressed to Wilma, jealousy takes over, leading him to enlist the help of Bedrock's best detective, Perry Gunite, to uncover the identity of the poet. Gunite's snooping mistakenly points the finger at Barney. Fueled by a desire for revenge, Fred sets his plan in motion until Wilma intervenes, reminding him that he was the one who penned the poem during their early romance.