Attempt at a synopsis take 2: I've tried to decide which parts of the story to flesh it out with. Is this enough for it to make more sense?
Synopsis – The Magic Beach Hut by Kate Backhouse
JAKE and his family are booked into MRS MACAROON’s guest house for their summer holiday. Mrs Macaroon is a horrible, grumpy and frightening lady and their first night there is so disastrous that they check out. The family think that the holiday is over as they can’t find another guest house so they set out to enjoy a single day at the beach before returning home.
A chance encounter with a mysterious old man leads to Jake’s sister POLLY finding the key to a dilapidated beach hut. They go inside and find themselves in a grand old house. Going out of the front door takes them back to the modern holiday resort but going out of the back door takes them back in time to a Victorian village where they meet a boy called ALF.
Alf is a bad and miserable boy who nobody likes and their first meeting is very unsettling. He is a liar and a thief and he throws stones. Polly’s instinct is to fight back but Jake realises that there is sadness behind Alf’s anger. Alf does not have the kind of secure and loving family that Jake and Polly take for granted. By befriending him they gradually transform him into a good and cheerful boy eventually giving him his first ever birthday present, a toy train from the magical house. It turns out that Alf is Mrs Macaroon’s grandfather. As Alf changes so too does Mrs Macaroon so she becomes a lovely colourful old lady by the end of the book. Her transformation culminates in her giving Jake the same train and through this Jake and his family discover that kindness is the strongest magic of all.