16 books in series

The Further Adventures of Sherlock Holmes by Titan Books

The Further Adventures of Sherlock Holmes by Titan Books is a 16-book series with 16 primary works first released in 1976 with contributions by Richard L. Boyer, Loren D. Estleman, Edward B. Hanna, Fred Saberhagen, Sam Siciliano, C.E. Lawrence, Carole Buggé, David Stuart Davies, Steven Savile, Robert Greenberger, Stuart Douglas, and Eric Brown.

The Giant Rat of Sumatra
Sherlock Holmes vs. Dracula
Dr. Jekyll and Mr. Holmes
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The Further Adventures of Sherlock Holmes

Seance for a Vampire
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The Angel of the Opera

The Further Adventures of Sherlock Holmes: The Star of India
The Haunting of Torre Abbey: A Novel of Sherlock Holmes
The Further Adventures of Sherlock Holmes - The White Worm
The Further Adventures of Sherlock Holmes: The Ripper Legacy
The Further Adventures of Sherlock Holmes - Murder at Sorrow's Crown
The Further Adventures of Sherlock Holmes - The Counterfeit Detective
The Further Adventures of Sherlock Holmes - The Instrument of Death
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The Further Adventures of Sherlock Holmes - The Martian Menace

Further Associates of Sherlock Holmes
Further Encounters of Sherlock Holmes