In fact, Magico published several Sherlock Holmes forcing books and book tests including:
"A Study in Scarlet" (1979, sold as "The Sherlock Holmes Force Book," limited edition of 200 copies, hard cover, except for the first page all of the pages are duplicates, published with various color covers)
"The Hound of the Baskervilles" (also 1979, it was also sold as "The Sherlock Holmes Force Book," limited edition of 500 copies, hard cover, except for the first two pages all of the pages are duplicates, published with various color covers)
"The Sign of Four" (undated but postdating the two aforementioned "Sherlock Holmes Force Books," it was sold as "Telementary, Dr. Watson," hard cover, except for the first page it consisted entirely of three different blocks of duplicate pages numbered 36-37, 92-93 and 178-179 respectively, published with various color covers)
"The Untold Sherlock Holmes" (1983, sold as "Creations by Sam Schwartz" it is a genuine, readable hard cover book -- with dustjacket -- that has been written for use as a forcing book/book test as well, it relies on branching/interlocking anagrams to reveal force words on certain pages) although sold by Tannens and other dealers, it was produced by Magico.
"Sherlock Holmes and the Wood Green Empire" (1985, sold as "Two Minds by Himber and Becker" it is another genuine, readable hardcover book -- with dustjacket -- that has been written for use as a forcing book/book test as well, a participating audience member follows a convoluted procedure that appears random but actually results in forcing one of two words)
There is also what appears to be one of the Sherlock Holmes book by Val Andrews that is one of the three books provided with Terri Rogers "Master Key" book test published/marketed by Martin Breese. It is "Sherlock Holmes and the Houdini Birthright" which is a genuine, readable paperback; however, what is provided with the "Master Key" is merely the cover of the genuine book by Andrews placed on the actual contents the same specially gimmicked text as in the other two books (and which has nothing whatever to do with Sherlock Holmes and in which his name never even appears). Putting the Val Andrews cover on a different book was an easy matter Martin Breese as he is also the publisher of the genuine one as well -- and, presumably for some, if not all, of the other 20 or so Sherlock Holmes books by Andrews.