Last week, viewers saw Rosie (played by Helen Flanagan) unwittingly return home with a large amount of white powder in her luggage.
The drugs had been planted in her bag by her unscrupulous American boyfriend, who was subsequently arrested.
Having had a brush with the police themselves, Rosie and her sister Sophie (Brooke Vincent) decided to bury the stash in the local allotment.
In scenes to air on Monday, Rosie will end up revealing all about her problem to Adam (Sam Robertson).
Coronation Street: Rosie Webster will reveal all about her drugs stash to Adam Barlow
Coronation Street: Last week Rosie hid the cocaine in the allotment
Opportunist Adam decides to take advantage of the situation by phoning a contact in the US who confirms that Rosie's boyfriend is safely in prison.
By Wednesday, Rosie panics when she discovers that someone has dug up the allotment over night.
And Sophie is furious when Rosie tells her she thinks Adam might have stolen the cocaine.
Coronation Street: Adam will hatch a plan, having checked Rosie's boyfriend is safely behind bars
Coronation Street: Sophie Webster will be furious when she finds out Rosie told Adam what they did
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Rosie Webster's life in pictures
Tue, February 7, 2017
As Helen Flanagan returns to Coronation Street, we take a look at Rosie Webster's life in pictures.
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Coronation Street's Rosie Webster in pictures
The pair will have an argument on Thursday's episode about the dilemma, which is overheard by Weatherfield's most slippery resident Todd Grimshaw (Bruno Langley).
Has Adam stolen the illegal substances? And will Todd blackmail the sisters over what he knows?
Coronation Street continues next Monday at 7.30pm on ITV.