Pushkin Children's Books, London, 2017. Good secondhand copy.

Sally Jones is an extraordinary ape and a loyal friend. In overalls or in a maharaja's turban, this unique gorilla moves among humans without speaking but understanding everything. She

and the Chief are devoted comrades who operate a cargo boat. A job they are offered pays big bucks, but the deal ends badly, and the Chief is falsely convicted of murder.

For Sally Jones this is the start of a quest for survival and to clear the Chief's name. Powerful forces are working against her, and they will do anything to protect their own secrets.