When an affluent school teacher is found dead in an abandoned bookstore, the teachers and students at her school become suspects in the case. Meanwhile, Brennan's publisher encourages her to join Twitter to help grow her fan base, and "squintern" Jessica Warren teaches Brennan some tricks to master the Twitter-verse, skills Brennan enthusiastically puts to use.
The corpse found in a bookshop ruin is identified as Mia Ferrera, popular member of a charity organization which provides substitute teachers and special tutoring for troubled pupils. Booth and Aubrey find possible motive and/or opportunity for her ambitious colleague Shane Gentry, neglected lover Hunter Ellis, orphaned protégé Marcellus, his overprotective big brother Keith Miller and janitor Paul Garnett.—KGF Vissers