Ghostwriter writes a name and a phone number connected to THABTO to Alex and Jamal, who deduces that he must be one of the backpack thieves.

With the coded message that Gabby found in her backpack, Alex determines that the letter R stands for the letter E, thus cracking the code and deciphering most of the messages.

After Alex follows a suspect to a video game arcade, the team deduces a group of four Double Defender players are THABTO and the backpack thieves.

Alex and Jamal deduce that the THABTO note is written in a secret code and work to decipher it.

Jamal lets out his frustrations by writing a letter to Mr. Brinker after being treated poorly. After venting, Jamal rewrites the letter to be more positive and understanding.