Anders and Lotta are newly in love. Everything would be great if it weren't for Anders' partner Sofia and Lotta's husband Kurt who still doesn't know anything. Anders is an ornithologist and when he hears that a real rarity, the Mongolian Pipit, has been seen on Gotland, he sees his chance to see his three hundredth bird and become a member of the prestigious Three Hundred Club. But it also means that he can be alone with Lotta. Before they can tell their respective that they love each other, they are exposed.

Anders och hans kompis Ingvar är fågelskådare. En mongolpipare har setts på Gotland och Ingvar tycker att Anders ska åka dit för möjligheten att kunna bli medlem i den exklusiva 300-klubben, d v s bli en av dem som sett 300 arter. Anders flickvän Sofia är inte förtjust i att han flackar omkring i landet med kort varsel, för att titta på fåglar.