You can use Find in Regex mode and use a simple regex...
Code:
Mary Balogh \d{1,3}
That should find numbers up to 999. If numbers pass 1000, change the "3" to a "4"
Also ensure the "Case Sensitive" option is unticked as it looks like a mix of upper and lower case first letters.
The Replace is up to you. Leave it blank/empty or add a space.
Test on the first few one at a time and see how it works.