This book was 5 stars but the last 20% lost it two stars imo. 
First of all, it's an interesting ass premise 
Second of all, ask yourself what gender is K and are you absolutely sure you're correct 
And personally

i wasnt really a fan of multiverse ending stakes that ended up not being real? I still dont get how k won the game. Everything in the clues kept pointing to moonrise and the gatewick building but she won because she repeated what her and annie did as kids? And there was some cosmic stuff that i didnt really understand. But it doesnt make sense??? Also you find out that your wife has been looking for you for years and you run off with your girlfriend? Idk man i didnt get the ending at all but the first half of it was great