This book took a moment to get in to. I think the last 4 sentences of the prologue could have been left out, so that the 'twist' later on could have had a flying chance of being surprising (for those not naturally suspicious-minded, and already suspecting it). It would have been fun to discover the twist alongside the characters rather than waiting for the penny to drop.
I was enjoying the brief following of Halt more than adventuring with Will, but fortunately after a bit Will, Horace, and a newly introduced character, started getting down to business and things moves swiftly on from there.
A lot of lore, countries and characters are introduced in this book.
As other reviews say, the ending is a cliffhanger, so be forewarned.