I Found the ending of the first book as Valkyrie found out she has magic.
I thought the second books ending was kinda crummy although it was still up there.
The third books ending was really sad as it leaves you feeling that skulduggery is gone forever.
The fourth book, I HATE THE CLIFFHANGER!!!! Expecially how I had to wait for the book to come out.
The fifth books ending broke my heart. Tanith was my favourite character.