'Overcome by toxic enemy gas in the muddy trenches of Flanders, Jim and Wally are sent to hospital in London. Mr Linton and Norah whisk them off to recuperate in the clean air and safety of Ireland – via a hazardous crossing of the Irish Sea.
'Ireland entrances them, and catching trout thrills them as they fish the lochs. They encounter a crippled man who turns out to be a delightful wealthy landowner only too glad of their company. They go touring the countryside with him, experiencing life in the villages and being enthralled by his knowledge and stories of old Ireland.
'Car troubles strand them at a seaside village for a few days, where the boys discover a sea cave with a hidden cache of fuel tins indicating the proximity of a German submarine. Risky plans are set afoot for enemy capture. They succeed, but at great cost.' (Publication summary)
