1 Work by WhatYearAreYouFrom in Fablehaven Series - Brandon Mull
About three months before being kidnapped and replaced by a stingbulb, Kendra began dating her best friend, Alyssa Carter. The only people who knew were Seth, who found out because he walked in on them kissing once, and Warren, who Kendra told on accident.
And the Sphinx, who had people watching the young Sorenson siblings.
Kendra and Seth's parents were not the only people who went missing.