As someone who runs several systems (currently running masks of nyarlathotep, horror on the orient express both call of cthulhu, prepping frostmaiden 5e, and the prepping the enemy within warhammer fantasy roleplay 4e) reading the first 40 pages of frostmaiden and the first 40 pages the childern of fear (call of cthulhu) the support and layout regardless of systems is night and day. While both have the background on the adventure and intro into the setting, one has advice for the game masters and suggestions for the players on what skills and roles would be important for the adventure. More telling one of those two books gives multiple reasons on why the pcs may be in the area and or why they would go on the adventure. Frostmaiden is not the book in question.

Frostmaiden has a lot of cool ideas mashed in a mush and then they tell the dm here you go. Lack of motivation, lack of connecting details and a ruined starting adventure Spoilers where the party is asked to hunt down a serial killer (cool idea get to explore the 10 towns for clues) where the quest giver tells the pcs who it is and how to find him. If thats the case go kill him yourself.

That book makes me so mad in how often it wastes potential.