Fearín beag atá sa Lorgaire, ach dar leis féin is lorgaire mór é - sin duine a théann ar lorg rudaí móra. Maidir lena chara, Mac Giolla Mór, measann an Lorgaire go ndéanfadh sé cúntóir breá - d'fhéadfadh sé glas ar dhoras a bhriseadh dó, málaí troma a iompar, nó scanradh a chur ar bhithiúnaigh, fiú.
Ach anois, agus an tír faoi bhagairt ag dragan fíochmhar ón Tuaisceart, níl ag déanamh imní do Mhac Giolla Mór ach a bholg. Ní hamháin go gcaithidh an Lorgaire a chompánach ocrach a mhealladh le dul ar lorg an dragain, ach caithidh siad aghaidh a thabhairt ar bhithiúnaigh den uile chineál agus, ansin, an dragan mór mílteach seo a dhíbirt as an tír. Cé a dúirt go mbeadh sé éasca!!
The Lorgaire is a little fellow, but according to himself he is a big detective - someone who detects big things. As forhis companion, Big Mac Giolla, the Lorgaire thinks he would make a fine assistant - he could break a lock for him, carry big bags, or even frighten away rogues.
But now, as the land is threatened by a fierce dragon from the North, Big Mac Giolla is only worried about his stomach. And not only does the Detective have to convince his hungry friend to help him search for the dragon, but first they must battle against an assortment of rogues, and then banish this giant dragon from the country! Easier said than done!