Who else can help me solve this case?

Hint 1 of 20:

Note: in the interest of saving space, I've left out phrases like "Go to that
location."  If I mention a place/person in any way, you should visit it.

Hint 2 of 20:

You might want to start out by visiting the five victims' homes to see what
you can find out about them.

Hint 3 of 20:

Remember that Leo Shepard was not a victim -- Porky told you his real name.

Hint 4 of 20:

See Curtis Twiggs, Nathan Revell, Cyril Maude, Charles Attard, and Roland
Jaquard.

Hint 5 of 20:

You might also want to see Jaquard's father, Lord Astley Denham.

Hint 6 of 20:

When you went to Jaquard's house, you were told to see Bettina Ivory.

Hint 7 of 20:

She sends you to Landmark Limited.

Hint 8 of 20:

And the manager there tells you about Juan Escobedo.

Hint 9 of 20:

Juan sends you to see his brother Marco Escobedo.

Hint 10 of 20:

Marco Escobedo lists The Ring and Spaniard's Inn as alibis.

Hint 11 of 20:

Revell and Jaquard were both members of the Bagatelle Club.

Hint 12 of 20:

At the Bagatelle Club, they tell you Moran went to the Tankerville Club.

Hint 13 of 20:

Langdale Pike told you that Roland Jaquard was in love with Letitia Garcia.

Hint 14 of 20:

Don't you want to find out where the woman who visited Jaquard went?

Hint 15 of 20:

The Central Carriage Stables will say that she went to the Elephant and
Castle theatre.

Hint 16 of 20:

The manager there also tells you that Lester Oglivie was seeing Garcia.

Hint 17 of 20:

Revell had an account at the Bank of England.

Hint 18 of 20:

Maude was a prisoner at Millbank Prison.

Hint 19 of 20:

Revell worked at Lindsay and Company.