''I can''t remember how old I was when I first started collecting stamps. But I''ve got a whole shoebox full of them now.

Mam used to help me collect them ... Before she got so ill that she lost her job, her friends...everything.

Now it''s my job to take care of her and protect her - and my little brother and sister too. But to do that, I have to make Mam a Secret. A secret no-one can ever find out about. Not even my best friends at school, or Mo, our postman.

Or the stranger living in the house across the street. The one no-one has seen, but who I know is spying on us.

The one I think might be Them...''

Deep in the heart of Swansea, Wales, lives a small girl with some big secrets to keep. Secrets that make her one of the best actresses on the planet - because no-one would ever think that, away from school, Audrey is the sole carer for her increasingly sick mam and her two younger siblings ... or a seasoned thief.

With her worlds threatened by the arrival of a mysterious, invisible neighbour, behind whose closed curtains and shut front door may lie a spy, Audrey must take matters into her own hands to save her family.

Inspired by her beloved collection of stamps, her friendly neighbourhood postman (and fellow stamp collector), and her two best friends, off Audrey must go: on an adventure that will lead her to places - and hearts - she never knew existed.

Celebrating the hidden army of Young Carers daily keeping their loved ones alive behind closed doors, and the everyday s/heroes that surround them, The Letter with the Golden Stamp delves into the fears and hopes of Young Carers everywhere, and the invisible sources of kindness knocking on all our doors.