I recently finished a book where the MC finds out she's half-elf. She's been living as a human for about 27 years and many of her elven memories have been suppressed. Her husband tracks her down because he needs her help in usurping the throne from his father. After wheeling and dealing with others in the paranormal realm(s), they go to the elven kingdom and after much lead-in and build-up on THERE MIGHT BE THIS HUGE BATTLE WE HAVE TO PREPARE FOR, several chapters spent on her re-learning how to fight using her elven instinct, several characters introduced to help them but doing very little except arranging meeting with each other, THE HOUR OF THE REALLY HUGE BATTLE HAPPENS!
And it's over in less than two pages.
(The last time this happened, A REALLY HUGE BATTLE was supposed to happen and the characters camp for the night on page 134. On page 135, they're exclaiming BOY, THAT REALLY WAS A HUGE BATTLE WE FOUGHT! and by page 136, I'd quit reading.)
Then all of these characters who may be friend or foe that have been introduced, especially one Really Important Character who's introduced in the next to the last chapter and the MC may or may not recognize him, but her elven instincts tell her she does and all of these repressed memories she needs to recover to help her husband?
We have to wait for the sequel.
If it weren't on my Barnes & Noble nook, I would have thrown this book across the room with such force, it would have sent a shock through the very time/space continuum and canceled the rest of the series.