Start: The party found the book wrapped in oilskin in one of the shipwrecks off Solstice. It's a completely optional sidequest.
Structure: This adventure is very much a railroad. Rather than change it, I'm lampshading it. The book is the magical equivalent of a holonovel. Moving through the story linearly is a limitation of the magic.
Death and time: This adventure suggests players are kicked out on zero hp. Since i don't want this happening too often I changed this so they are only booted if they actually die (death is impossible, nothing is real in this adventure). The suggestion that a character can take a long rest then jump back in for the next encounter implies time travels more slowly, roughly 8 hours outside for each hour inside. I decided to reverse this, so if a character gets booted and takes a long rest the will miss the rest of the adventure.
Difficulty: for a level 8 adventure the difficulty level is set a bit low. Especially the random encounters, which are barely trivial. I decided that since I am playing online I would skip most of them, and just run the least easy - the wereboars, increasing the number to three. I also added an extra ettercap and gave the hag full coven spells.
Art: for use online I colorized the Hag's Hovel map. I may use a different map entirely for the final encounter if I can find a better one.
Reward: I swapped the Ring of Shooting Stars for an Amulet of the Devout +1 (Tasha's).
Final thoughts: I didn't use this idea, but one thing this book could be used for is as a hiding place for a treasure. It could even be one of the other books, such as ZZT. Since where better to hide a book than inside another book? Alternatively, it could be the party who has something they need to hide.