The Speed of Falling Objects by Nan Fischer

I loved this book because it starts in the aftermath of a plane crash, so it immediately pulls you into the adventure and terror of having to survive in the Amazon without proper supplies. After the initial scene, it gives the backstory and fleshes out the complexities of the characters while still letting you see the full picture of their complicated relationships one small piece at a time. The main character is completely ill-prepared for the situation which gives not only a relatable realness but also inspires hope and optimism.