The Murderer's Ape book by Jakob Wegelius

A captivating story about dark truths and heinous crimes as well as unexpected friendships, with detailed black-and-white illustrations throughout. Perfect for fans of mystery and detective stories.
 
Sally Jones is not only a loyal friend, she’s an extraordinary individual. 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 harrowing quest for survival and to clear the Chief's name. Powerful forces are working against her, and they will do anything to protect their secrets.