Hi there! thank you for your feedback.
The note (aka holding space for a book, which we unfortunatly could not insert in time) is refering to the nordic legend of "Irrlichter" (will-'o-the-wisp) which are small lights often appearing at night close to lakes or marshlands/swamps and leading people into them. Often people died while following the Irrlichter because they ran into the swamps o.e. and were stuck or started drowning.
We did this reference because of the lake nearby the house as well as to introduce Herbert, whose artstyle is based on an Irrlicht.