How would wewe write a Synopsis?

Here's one for my current novel

After eighteen years in America Larry Talbot returns to his homeland in Wales United Kingdom due to the death of his elder brother. Upon his return he ends up under the circumstances where he had to try to save a local girl from being mauled kwa a mbwa mwitu in the struggle he is bitten.
As the tale progresses He starts to have 'dreams' of turning into a mbwa mwitu and attacking the villagers, and then waking to find they had come true. The fine line of real and fiction seemed to be fading for young Larry Talbot the only one that will listen and believe his tale is an Old Gypsy woman.
The tormenting desperation rises as the tale progresses.

the synopsis is different every time i write it but it has some of the same content its a bit ruff but i'll figure it out eventually
It's based on Curt Siodmak's 1941 screenplay the mbwa mwitu Man