I enjoy this thing greatly.
The large investigation boost can be used to let a less than stellar base beat mid level locations routinely or power through low difficulty spots and harness the card draw.
On the other hand it can synergize with folks like Ursula Downs or Rex Murphy, 4 character who want to be clueving but might be spending a lot of actions on other stuff like evading and moving, this will help those mid-hight stats beat big locations while simultaneously help you assemble your combo pieces.
Notably, the book character Daisy Walker has a funny way of being too busy with her book engine to actually properly engage as a cluever, handing her this specific book means that she get's to do her book thing but also progress the map a lot faster.
You -could- combo this with secret-mechanics like Ariadne's Twine but this is less a destination for secrets than it is a target of opportunity in a secrets based deck.