Jacob Bird lives in Riga with his father. Jacob loves maps like his dad, and is fascinated by the legend which warns that no one must say `Riga is ready' or the river will flood the town, tall ships will sail down the main street, and the city will have to start all over again. One day Jacob mutters the fateful words. But all that happens is he is sent to live for the summer with his grumpy cousin Mimi and Uncle Eagle, because his dad is too busy to look after him. But strange things are afoot in the run-down Maskatchka district of Riga, where Jacob now has to live. Evil Skylar Scraper's scheme to transform it into a concrete jungle is being fought tooth and paw by the stray dogs, lead by their fierce commander Boss, his mate Bianca and their twin puppies. Jacob is astonished when Boss starts to talk to him, but hurt when Mimi doesn't want him to join their fight against Skylar. Then Bianca goes missing and Jacob's maps may be the only thing that can bring her home and save the talking dogs of Maskatchka.
Comme chaque année, pour le 31 décembre, on fait la fête ! Mais Teo et sa nouvelle amie Poga s'ennuient un peu chez les amis de leurs parents... Alors, ils admirent un tableau : La Princesse au singe. La princesse est bien là, mais le singe, lui, a disparu. Et eux, Teo et Poga, sont enfermés dans le tableau qui a été peint il y a plus de 100 ans ! C'est là que tout commence... Une enquête menée de main de maître par Luize Pastore, traduite avec gourmandise par Nicolas Auzanneau et illustrée des couleurs du mystère par Elina Braslina.