I created an empty book record in calibre with the title "Mrs Harris Goes to Moscow" and author "Paul Gallico" and I was able to find that book at the Brooklyn Public Library site with this plugin. If it isn't working for you then post a log from a search job and I will take a look at it to see what might be going wrong.
Overdrive Link found: No changes.
Starting job: Search for books by 1 author
Overdrive Link 2.53.0, calibre 6.12.0
Search formats: Adobe EPUB eBook, Kindle Book, Mobipocket eBook, Open EPUB eBook
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Finding library books by Gallico, Paul
Accessing library FLP
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https://freelibrary.overdrive.com/
new OverDrive site layout detected for FLP
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https://freelibrary.overdrive.com/advanced-search
Search for recommendable books is supported by FLP
Search FLP for harris by paul gallico
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https://freelibrary.overdrive.com/se...rtBy=relevancy
Response: page 1 of 1. 1 total results
Found: Mrs Harris Goes to Paris & Mrs Harris Goes to New York by Paul Gallico [452781@, @freelibrary.overdrive.com, English]
Found 1 book in 1.0 sec
Accessing library SCL
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https://solano.overdrive.com/
new OverDrive site layout detected for SCL
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https://solano.overdrive.com/advanced-search
Search for recommendable books is supported by SCL
Search SCL for harris by paul gallico
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https://solano.overdrive.com/search?...rtBy=relevancy
Found 0 books in 1.3 sec
Accessing library SFPL
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https://sfpl.overdrive.com/
new OverDrive site layout detected for SFPL
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https://sfpl.overdrive.com/advanced-search
Search SFPL for harris by paul gallico
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https://sfpl.overdrive.com/search?qu...rtBy=relevancy
Found 0 books in 0.6 sec
Accessing library Freading
Search Freading for harris by paul gallico
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https://freelibrary.freading.com/sea...Zvcm1hdH1lcHVi
1 total result
Found [OTc4MTQzOTY3Njg4Mg==@fr, @fr/freelibrary, Adobe EPUB eBook]
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https://freelibrary.freading.com/sea...Zvcm1hdH1lcHVi
1 total result
Found [OTc4MTQzOTY3Njg4Mg==@fr, @fr/freelibrary, Adobe EPUB eBook]
Found 2 books in 1.4 sec
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Opening cache database /Users/rebekah/Library/Preferences/calibre/plugins/Overdrive Link Cache.db
Opened in 0.0 sec. Cache is 874,496 bytes and contains 0 items.
Cache disabled by user
Getting info for 452781@FLP
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https://freelibrary.overdrive.com/media/452781
Updated book info: Mrs Harris Goes to Paris & Mrs Harris Goes to New York by Paul Gallico [452781@, @freelibrary.overdrive.com, Adobe EPUB eBook|OverDrive Read, 9781408813782, Bloomsbury Publishing, 2010-08-02T04:00:00+00:00, English]
Getting info for OTc4MTQzOTY3Njg4Mg==@Freading
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https://freelibrary.freading.com/ebo...QzOTY3Njg4Mg==
Updated book info: Virginia's Civil Rights Hero Curtis W. Harris Sr. by William Paul Lazarus [OTc4MTQzOTY3Njg4Mg==@fr, @fr/freelibrary, Adobe EPUB eBook, The History Press, 2023-02-15T00:00:00+00:00]
Getting info for OTc4MTQzOTY3Njg4Mg==@Freading
Get
https://freelibrary.freading.com/ebo...QzOTY3Njg4Mg==
Updated book info: Virginia's Civil Rights Hero Curtis W. Harris Sr. by William Paul Lazarus [OTc4MTQzOTY3Njg4Mg==@fr, @fr/freelibrary, Adobe EPUB eBook, The History Press, 2023-02-15T00:00:00+00:00]
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Matching 1 calibre book with 3 library books
Found 0 matching calibre books in 0.0 sec
You can see what other OverDrive libraries carry that book from this page:
https://www.overdrive.com/media/920235