How are these sections divided?

Hint 1 of 4:

Read the "What's so special about this file?" question in the "About this UHS
file" topic to learn how this hint file is arranged.  The hints below will
match the locations with the topics that you need to look under.

Hint 2 of 4:

Sarah's Boyfriend: 221B Baker Street, Alley, Sarah Calloway's Flat, Chancery
Opera House, Belle's Parfumerie, South Kensington Field, Southwark Morgue,
Scotland Yard, Eaton Dormitory.

Hint 3 of 4:

Anna's Flat: St. Bernard's Publick House, Antonio Caruso's Flat, Anna
Calloway's Flat, Law Office of Mr. Jacob Farthington.