"All Out War" by Tim Shipman has a lot of the details of the post Brexit manoeuvring for power - Boris appeared to be completely disorganised and with a poorly managed team. One particular event described is where Boris probably lost the PM role because he got mixed up about sending a text to tell his team to tweet that Andrea Leadsom was joining the Boris & Gove team. Leadsom backed out after hearing nothing from Boris and announced that she was running on her own behalf and then Grove did the same.