- Author: Jordan Stratford
- Binding: PB
When, in an alternate 1826, an 11-year-old girl genius (Ada Lovelace) finds friendship with a 14-year-old gal who's a romantic at heart (Mary Shelley), the adventure begins! Together, they form a secret agency with one goal: catching clever criminals. An heirloom gone missing, a confession (false) and suspects aplenty ensue. The two employ math, science and some creative analytical thinking to solve the crime.