The Vision and the Voice is a book that was written by Aleister Crowley in 1911:
With the book, the Dagger cipher is outlined:
And, so, “do you have a message” can be encipered as:
Now, can you find the secret message here:
Hint: https://asecuritysite.com/ctf/ctf_dagger
And if you like ciphers, there’s 131 of them here: