Absolutely adore Sean and Alexei so I loved that they get a novella dedicated to their wedding and honeymoon - even if the latter gets a bit sidetracked.
The action is sort of minor, but I enjoyed the glimpses of Liam and a new character which sets up groundwork and teases at the last book in the series. 
I also kinda really enjoyed seeing a mission failing?! And the book just ending with that? It was just nice to see that these usually overpowered characters can fail too (without too bad setbacks, of course.)