'Enjoy your football and you'll always be a winner!' yelled the coach.
The Crokes are doing well in the football league this season, but off the pitch things aren't so good; Danny's dad, the Crokes' coach, is having a hard time - he's worried about his job, and his friends' daughter, Clara, is sick and needs an expensive operation.
But GAA is like one big family, and when Danny and the Crokes hear that Clara is the captain of her GAA team in Boston, they're determined to raise money for her. Despite some hitches along the way - like trouble with Trinity, the girl he has his eye on - between training, school and a fundraising football marathon, Danny and the Crokes make this a season to remember!
Joe O'Brien lives in Ballyfermot in Dublin with his wife and children. He is the author of nine Alfie Green books as well as three books in the Danny Wilde GAA series for older readers and one fantasy novel, Beyond the Cherry Tree. He has appeared on RTE's The Den, TV3's Ireland AM and many radio shows. His book Alfie Green and the Chocolate Cosmos was shortlisted for Children's Book of the Year at the Irish Book Awards in 2010. He regularly holds readings in bookshops and libraries around the country.