Happiness means such different things to different people - that's what writer Mary McCallum riffs on in her first poetry collection XYZ of Happiness. Mary's tells Lynn Freeman she's happiest when she's writing - she's not only a poet but also a novelist, songwriter and publisher. In addition, she founded Makaro Press in 2013 and her band's called The Brooklyns. This is her first poetry collection, but she's previously won awards for her adult novel The Blue and children' s novel Dappled Annie and the Tigrish. XYZ of Happiness is published by Makaro Press