Thundergirling gets intense as Tina hunts for a mole from a rival troop. Meanwhile, Linda gets her hair dyed blonde.
- Didn't Think This Through: Tina feeds the mole by telling each member of her troop a different lead. Both troops arrive at the restaurant, causing her to identify Rena as the mole. But Rena points out that it's her family's restaurant, so she could just as easily be the mole.
- Dumb Blonde: Linda believes she's becoming one of these after her dye job.
- Informed Flaw: Tina mentions that Linda's new hair matches her teeth. When her teeth do appear, they're clearly white.
- Secret Handshake: Troop 257 has one, which is how Louise finally smokes out the mole.
- Serious Business: Troop 257 treats cookie-selling like a criminal racket. Even their adult chaperone is a little scared of them.
- Something Only They Would Say: Rena reflexively reacting to 257's secret handshake is what gives her away.
- Token Good Teammate: 257's adult chaperone, who isn't in on their vicious cookie-selling war.
- Whole Plot Reference: To Tinker, Tailor, Soldier, Spy.