This episode goes through chapters 15-20. 15-19 brings us to the end of part 1, "Spark". Chapter 20 is the beginning of the grand adventure, "The Fire Within".
15: Sighting
16: Bonnington Disappears
17: Birthday Ideas
18: The Wrong Squirrel
19: Squirrel in the House
Part 2 "The Fire Within"
20: A Very Special Present