Tomb Raider - Before the Shadow

My aim is to write and fill in the gaps from (Spoiler Alert) the moment Ana, the Late Richard Croft's lover who appears in Rise of the Tomb Raider, is shot dead up until the point where Lara and Jonah set out for their next adventure which are the events portrayed in Shadow of the Tomb Raider. I want to capture the events and emotions that Lara is going through after her ordeal and how she is copying with everything that is going on around her. This will be my first fiction piece as my previous experience has been writing memoir-styled books on past experiences so hopefully I don't completely butcher this!
Comments and feedback would be greatly appreciated. Any further questions or ideas feel free to tweet me @SnazzyMeow