At the Næsbygaard estate, the old landowner misses his grandson Martin, who is on a cattle farm in Texas learning about agriculture. The estate's shooter is ill, so the stud master has to take care of his job as well. This comes at a time when he is training hard for the gallop race for the King's honorary prize. To help lift their spirits, they are visited by some children from Copenhagen who are on vacation. When serious problems arise involving poaching on the estate's land, the children help to solve the case. The stud farm manager is injured, and it looks as if the estate's horse will not be able to participate in the big gallop race. But luckily, young Martin returns home from Texas just in time....