This is the fourth book in the series ‘Eachtrai Réics Carló’. An Gúm are reprinting this series of mystery books for children that were first published in the 1940s. They are adventure stories written for children that feature a mystery to be solved in each book. In this book, Dúnmharú i bPáirc an Chrócaigh the All-Ireland Final in Croke Park comes to an abrupt end when Seán Ó Glaimhín, the best hurler in the country, is murdered on the pitch.