After Mike loses Pia, his partner of seventeen years, best friends Vicky and Zaza rally round.

But the truth is, in Pia's absence, they all need more than a little help . . .

Just-engaged Zaza fears the next step. Mum Vicky has lost sight of herself. And Mike can't figure out how to start again.

Luckily, Pia left a list of loving instructions to help them cope.

Which is why they find themselves trekking in Peru. Stumbling up mountains. Lost in sweltering rainforests. As friendships and hope fray, they cling to their faith in Pia.

Soon they learn anything is possible when you're walking on sunshine.