When Roy announces the shop needs a new team leader, Dan is quick to tell everyone that with her killer twin combo of cleverness and bossiness, Dani is a shoo-in for the job. But Roy soon puts a Grogan's twist on things: the righteous one must solve an impossible maths conundrum in order to claim the title. Everyone is shocked when the puzzle is mysteriously solved later that day but the Secret Solver refuses to come forward and claim their prize. Touched by Dan's faith in her and with her crush on him as strong as ever, Dani hears herself 'owning up', even though she knows it was secret brainbox Alyssa who couldn't resist solving the mathematical mystery. But Dani's calculations backfire when Grogan's head office decide to make her their maths whizz poster girl - will desperate Dani be able to pull off super smart?
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