The lord of the Aztecs. Book 4. Jarman D.

The little Tofer Talley's little sister fell ill, and the cats, including ka, had to be evicted to the barn in the garden, because the kids often have an allergy to cat hair. Topher does not find a place for himself because of anxiety for the pet and sister, but Tally's health, meanwhile, is worsening.

And then also Ka disappeared again! To find her, the boy goes through time and space into the past, where he is waiting for a meeting face to face with the famous conquerors and cruel Aztecs - in other words, the most exciting adventure with the ka!