It was very generous of WW to put the Cradle books 4-8 on Audible Plus. I would not have pursued this series after book 3 tbh. Neverending progression, always something or someone stronger than you regardless of what level you achieve. it gets to feeling like a stairmaster. It just keeps making more steps! No conclusion leads to a dissatisfied feeling for me. Not the feeling I’m looking for in anything I read or listen to.