The Mráz family is preparing for holidays. Parents are traveling to the spa and little Petr is going to the country to his grandparents. In addition, to the chaotic preparations, mother's friend is bringing a dog Blek. She wants Petr to look after it. Grandfather welcomes Petr and the dog with pleasure because he needs the ally against strict grandmother. Grandfather is not very skillful and thus grandmother often experiences troubles with his ideas.

When famous detective Nick Carter visits Prague, he becomes involved in strange case of a missing dog and even stranger carnivorous plant. He becomes convinced that he is standing against his greatest enemy, the Gardener, who supposedly died years ago in a swamp...

Former sailor Kotrba, nicknamed the Admiral, has one dream, to take his own ship to sea. He's been building it for five years and now it's finished, but he still needs money to buy an engine. He asks for financial support from his friend Pošmurný. But he uses the excuse of his daughter's wedding. He has money set aside for a dowry, so he cannot lend his friend anything. Then Kotrba gets lucky - he wins a voucher for goods worth 10,000. But there's a hitch. He can only redeem the voucher for goods at the local unity, where he has become the 100,000th visitor. But Admiral Kotrba is foxy about it. Let's see what he comes up with!