Dolly and Dylan panic when Dorothy appears to have stolen Clarissa's new collar, so they plan to sneak into Clarissa's house to return the collar.
The dalmatians come to the park where Clarissa is showing off her new pink diamond necklace which she claims is expensive. Dorothy walks up to her and sneezes, resulting in Clarissa insulting the young puppy. Dylan and Dolly decide to get back at her by calling for "dinner" and having all the dalmatians run over Clarissa and her friends. Later while in the backyard, Dylan overhears Clarissa saying how she would be upset with whoever stole her necklace. Dylan is surprised to see Dorothy chewing on the necklace itself and tells Dolly about it. While humored by the situation, she realizes that this is disastrous and that they need to pull a "reverse heist" to get the diamond necklace back into Clarissa's house before she notices it is missing.
Dylan and Dolly recruit the Canal Crew to aid them in making a distraction to scare Clarissa and Hugo out of their house. Afterwards, they back out of the rest of the plan. Dylan and Dolly have Diesel dig a hole straight into the house while the Dmitri Trio act as lookouts, albeit poorly as they cause a mess. Dylan and Dolly sneak through the house dodging surveillance cameras and light detectors until they come across the room where Clarissa's necklace is to be kept. Dolly manages to get through, but upon opening the jar, sees that the necklace is still in there and sounds the alarm by accident.
Dylan and Dolly see that the Dmitri Trio have ineptly blocked their exit and they are all forced to hide. Hugo and Clarissa come back with Clarissa looking to see that her necklace is still there. Pearl and an officer come by to check. As Clarissa comes out to tell Pearl that everything is okay, she realizes that she has a similar diamond necklace on her nose and sees that everyone has one. realizing that her necklace is a cheap product, she attacks Hugo. In flashback, Dorothy is revealed to have been given her necklace, but a generous Stanislav who was selling them to begin with.
- Josh Brener as Dylan
- Michaela Dietz as Dolly
- Margot Powell as Dorothy
- Rhys Isaac-Jones as Dawkins
- Bert Davis as Diesel
- Rocco Wright as Dmitri Trio
- Harriet Carmichael as Clarissa
- Aimee-Ffion Edwards as Arabella and Big Fee
- Bethan Wright as Prunella
- Doc Brown as Sid
- Conor MacNeill as Fergus
- Rufus Jones as Hugo
- Michael D. Golab as Stanislav
- The Faberge Egg that Clarissa owns shows up in the next episode.