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Cosmo thought he had enough problems, with his absent mother, ridiculous name, and status as 'loser kid' at school. But his Grandfather isn't the man he used to be - the man that Cosmo idolised. Sometimes, he can't remember what day it is, or where certain things go in the kitchen. And then other times, he can't remember who Cosmo is, or that Brian, Cosmo's brother, died. Cosmo does all he can to help him, but post-its on the cupboards and omega-3 oils aren't enough to keep doctors from coming to assess Grandfather and deciding he needs to be taken into full time care.

I wasn't sure how old he was meant to be, and I guessed the twist at the end within about five minutes of Cosmo being in the past - though I think that's more symptomatic of the fact I read a ''lot'' of time travel books! - but apart from that, this was a pitch perfect book that had me hooked from the first page and refused to let go. A fantastic debut from an author to watch.

This reminded me a lot of [[The Boy in the Striped Pyjamas by John Boyne]], though less harrowing. Slightly older readers might also enjoy [[The Curious Incident of the Dog in the Night Time by Mark Haddon]].