When a love letter addressed to L. Loud arrives, the family tries to figure out who it was meant for.
Lincoln is outside, collecting the mail, and while sifting through it, he comes across a letter that shocks him so much, he immediately calls an emergency sibling meeting. Once the siblings are gathered, Lincoln presents the object that led him to hold the meeting: a love letter, addressed to "L. Loud". Lori opens the envelope, and reads the letter:
"Dear L. Loud, Day after day, I hope and I pine, I'm too shy to come forward, But I wish you were mine. -Signed, your secret admirer."
Immediately afterwards, the siblings begin to question who the letter is for, since it could be for any of them (which is supported by a series of flashbacks depicting the siblings fawning over their respective crushes). Lucy, having read a book about vampires dealing with romantic relationships, suggests on sending their crushes a signal to let them know that they're interested in them, which will lead to them writing a second letter, and give more information. The siblings agree to go with this plan, as each of them approach their respective crushes, while giving them a subtle wink, to let them know they like them.
The next day, the siblings are holding another meeting, where everybody says that they sent their signal to their crushes. Luna then arrives with the next letter, and Lori opens up the letter, and a single rose falls out of it, causing the siblings to gasp in wonderment. Lori reads the letter:
"Roses are red, They brighten our town, Like your sweet smile, And your hair, which is brown."
With this information, the choices are lowered to just Luna, Luan, Lynn, and Lisa, much to the dissatisfaction of the other Loud siblings. Although everyone is excited, Luna isn't happy, saying that she didn't give her signal to her secret admirer, Sam, because she feels that Sam is out of her league, but everyone else assures her that she's still in. Lucy pulls out her vampire book, and says that because the secret admirer sent a rose as a token of their affection, they need to give their crushes a token in return, which will lead to a third and final letter requesting a rendezvous. The four siblings then proceed to give their respective crushes their tokens of love. For Lisa's crush, David, an actual beating heart (from a pig). For Lynn's crush, Francisco, her lucky jockstrap. For Luan's crush, Benny, a pie in the face. Luna tries to give Sam her favorite guitar pick, but is unable to muster up any confidence and holds herself back.
The next day, Leni arrives with the third and final letter, which reads:
"Dear L. Loud, Here's a third letter, 'Cause I'm still feeling skittish, I dig your sweet sounds, And love of all things British."
The siblings realize that Luna is the intended recipient, and Lori further reads on the letter:
"I think it's time We put love on the menu, Meet me tonight at Banger's & Mosh, The British eatery and rock venue."
Luna, now excited that she's the intended recipient, is carried off by the siblings to get her dressed up.
At Banger's & Mosh, the siblings await Sam's arrival. While waiting, they notice their parents are there, and Lynn Sr. wearing his British bearskin hat. They walk up to them, and the parents ask what they're doing here. Lincoln tells them they're waiting for Sam, Luna's secret admirer, because of the love letter that was sent to them. Rita, however, tells them that there was a mix up; the letters were meant for Lynn Sr. They explain that back then, when Rita was a crossing guard, Rita would fawn over Lynn Sr.'s British accent every time he would cross the road. However, because she didn't have the courage to talk to him, she instead slipped in some love letters to show her affection. After the third note, Rita finally had the courage to ask him on a date, and met at Banger's & Mosh, where they fell in love. Twenty years have passed since that first date, and it happens to be today. Luna says that because of that story, she feels more open to express her love towards Sam, and says that everybody should do the same.
The next day, the siblings discretely slip in their love letters to their respective crushes. Luna, with her love letter in hand, slips it into Sam's locker, and quickly departs. A trio of bandmates walk by, and Sam, who's revealed to be a female, stops to open her locker. She opens her locker, and the anonymous love letter that Luna slipped in falls out. Sam picks it up, reads the letter, and smiles, leading Luna to smile with confidence as well, thinking that Sam could return her affection after all.
Luna is revealed to be bisexual, as she is also attracted to Hugh, as shown in "Study Muffin".
Her bisexuality was possibly hinted in the scene were Lisa gives David a pig's heart, since the books where David can be seen standing on are put in an order that makes them resemble the bisexual pride flag
Because of this, this episode is skipped on Arabian, Greek, Malaysian, Turkish, and Russian dubs. In the Korean version, Sam's gender is changed into male as she has a male voice actor.
Coincidentally, this episode aired in 2017's LGBT pride month June.
On Russian airings, this episode's sister, Potty Mouth, was skipped as well.
Yes - After quoting "Dream On", Luna then quotes this band's song "Owner of a Lonely Heart", when describing her luck with Sam.
Alienware - The alien sticker on Luna's instrument case resembles the Alienware logo.
The Rolling Stones - The puckered up lips on Lynn Sr.'s shirt during Rita's flashback could be a reference to this band, whose logo is a red pair of lips with its tongue sticking out. This makes sense, since The Rolling Stones is a British band, and Lynn Sr. is a fan of British culture.
Bela Lugosi - The author on Lucy's book spells, Bela Le Ghosty, is a reference to this actor most famous for playing the titular character in the 1931 Dracula film.
The Da Vinci Code - Lucy's crush is like a character from Dan Brown's novel, who is also an albino named Silas.
The Who - Sam's shirt has a logo similar to the band's bulls-eye logo.
Plot Hole: If the love letters were all taken and read by the Loud siblings and never by Lynn Sr., then how would he know what's Rita up to?
One possiblity is that he found the love letters while walking on Lori and Leni's room.
When Luan kneels down over Benny, her shoe goes over the fallen set.
When Luna is on the bus wanting to give her token to Sam, her skirt is the same color as her shirt.
Also, Luna's right paperclip earring was missing.
When Lori said that Lucy was right about what happens next, her eyelashes were missing.
Young Lynn Sr.'s noticeable bags around his eyes were missing when he was on his first date with young Rita.
They were also missing when Lynn Sr. shouted, "Meat pies for everyone!"
When Lynn Sr. said "MEAT PIES FOR EVERYONE!", for one second, Lisa's mouth disappeared.
In the same scene, Whitney's eyebrows are missing.
After Luna puts the love letter in Sam's locker, Sam approaches the locker and opens it all the way. In the next shot, as she discovers the letter, the locker is half open.
Although Cristina Pucelli's minor character is changed to "Sam's Female Friend" in the cast section, she's still credited as "Girl #1" when the episode aired.
In the Brazilian dub credits, Francisco is accredited as he's voiced by João Victor Granja, when he never spoke in this episode.
Coincidentally, he also voices Silas and Skippy.
In the Latin American dub of the segment, Lucy's "sigh" line isn't heard.
Additionally, Paige's name isn't said in the dub. Also, Lincoln didn't say Sam's name when he was explaining his parents about the situation.
Possible: David's periodic elements blanket was missing the elements scandium, titanium, vanadium, chromium, and manganese.
The kids trying to impress their crushes.
Lana accidentally swallowing her gum whenever she gasps.
The kids trying to find out who the letter is from.
Lori being the one to read the love letters.
Lucy using what she learns about secret admirer letters to help her siblings and herself to figure out who the letter is from.
The siblings refusing to let Lisa read over the minutes about what happened during the last meeting.