The principle of these books is a lot of investigating with not much happening mystery-wise and an "eureka" moment late though this time we don't get extended exegesis discussing the solution. The journey is the fun. Robin is a major focus here, including final prep for her wedding (Matthew seems to earn some respect than late does something stupid) and dealing some with a college rape. Strike's respect for her, including in respect to this, is shown too. Both characters continual confidence issues (in their own fashion) also are expressed. Transabled people are a key plot point but mostly seen negatively (caveat by Robin).