Sibéal Pounder is the author of two much-loved and seriously stylish children's fiction series, Witch Wars and Bad Mermaids. Before becoming a full-time writer, she worked for the Financial Times where she researched the How To Spend It section and wrote the For Goodness' Sake column. Her first book, Witch Wars, was shortlisted for the Waterstones Children's Book Prize and the Sainsbury's Children's Book Award and she is also a World Book Day author for 2019.

Jason Cockcroft graduated from Falmouth School of Art in 1994 and has been working as an illustrator of children's books ever since. He won the Blue Peter Book Award for his work on Geraldine McCaughrean's retelling of A Pilgrim's Progress and was the illustrator on the original covers of the final three Harry Potter novels.

In the kingdom of Frostopia, mermaids Beattie, Mimi and Zelda have come to the aid of Maritza Mist, a famous water witch who supplies magic spells to the underwater kingdoms.

Two notoriously bad mermaids have escaped from Viper View prison and stolen Maritza's map that shows the locations of twelve magical objects. When brought together, these objects will create the most powerful water witch the world has ever known. Beattie, Mimi and Zelda set off to travel the underwater kingdoms to stop them. But they haven't counted on meeting a bunch of over-zealous spies, the oldest shark in the world or their faithful companion Steve the seahorse going rogue ...

On Thin Ice is the third book in the hilarious Bad Mermaids series from the superbly witty and creative Sibéal Pounder, author of Witch Wars and a World Book Day author.

Twenty thousand laughs under the sea. Dive into a fin-tastic, madcap adventure that's funnier than being tickled by a giant octopus. Bad Mermaids - swimming with snarks

Get ready for some feisty mermaids, evil piranhas and magical mystery mayhem

Funny, fishy and FANTASTIC (and that says a lot coming from someone with a mermaid fear)

You'll laugh your tail off - another winner from our favourite author

Bad Mermaids is tons of fun: stylish, packed with laughs and boasting a fab talking seahorse. The Little Mermaid meets Gossip Girl

Sibéal has done it again. Bad Mermaids is a fishy romp through a hilarious new world, rich in the kind of gorgeous detail that young readers love. Crabagram just in - Bad Mermaids is hilarious!