There are 2 books in the Effie series. The newest book is Effie the Rebel which came out in 2021.

1
Vote For Effie

Book cover of Vote For Effie
Shortlisted for the Blue Peter Book Awards 2020.

Join Effie Kostas as she fights to become Student Council
President in her new school.
With a campaign team of loveable misfits, she tackles the truly important subjects:



gender imbalance,

outdated school conventions...

and good-looking boys stealing the last slice of chocolate…
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2
Effie the Rebel

Book cover of Effie the Rebel
Effie is changing the world, one classroom at a time.

Dark forces are at work at Highworth Grange school: the student
council has been taken over by a tyrannical villain with his own
agenda. But Effie Kostas isn't about to stand by and watch democracy
crumble!

She's leading the resistance…