Young Koko has just moved with his parents from his idyllic countryside home to a big city. There, with the help of his new friends and a neighbour he investigates the mysterious case of a dead old man who used to live in the flat he has just moved into. Koko and the Ghosts is a family film based on a popular Croatian series of young-adult novels written by Ivan Kušan.
Witty and resourceful fourteen-year-old Koko solves yet another mystery - aided by his friends. One of them, Tomo, has recently moved to the city and longs for adventure. The boys notice that their new classmate acts curiously. Step by step, joined by their classmate Marijana, they unveil the boy's dark secret.
