The Memory Jar's Shadow. Jitter Jumpers, #41

Thirteen-year-old Fiona has always found solace in the forgotten corners of her family's sprawling mansion, a place that mirrors the hidden parts of her own history. But in the dusty silence of the attic, she discovers a "Memory Jar", a vessel not for memories, but for stolen joy. Fiona realizes that for every moment of happiness preserved in the jar, a shadow is born. To restore balance to her world and herself, Fiona must face a "crucible" of trials and learn that true happiness isn't a "static prize, " but a courage born from enduring the dark.