Frank and the New Narkiz by Livi Michael (Puffin, £4.99).

Fearles Frank the hamster is back for his fourth adventure.

He's previously discovered the Black Hamster of Narkiz and faced the Chamber of Fear, but when he infiltrates a top-secret hamster laboratory, even Frank is shocked.

Genetic modification has produced some horrifying results - long ears, buck teeth and green fur. Only Frank can save hamsterland.

Livi Michael's children's stories about Frank are great fun and the new Narkiz is bound to win her - and Frank - some new fans.