Reddit mentions of The Eleventh Hour: A Curious Mystery

Dude, that book and the Eleventh Hour by Base are freaken incredible. Thanks for reminding me of my childhood. I literally spent months looking/solving these.

The Eleventh Hour: A Curious Mystery?
https://www.amazon.com/Eleventh-Hour-Curious-Mystery/dp/0810932652/ref=cm_cr_arp_d_product_top?ie=UTF8

Or anything else by Graeme Base

It sounds a bit like The Eleventh Hour, minus the detective agency:

The Eleventh Hour: A Curious Mystery https://www.amazon.com/dp/0810932652/ref=cm_sw_r_cp_api_i_.cVnDbYGYHEXM

Hmm, this looks similar to The Eleventh Hour, which we had as kids, and spent hours on. There's a few red herrings in it, too, which took hours to solve, then turned out to be nothing. Wholely aggravating. My mom worked on it with us, and we never did figure it out. I ended up cheating by peeking at the answer. But I still have the book, and hope to work through it with my stepdaughter.

I started her slow, by going through Puzzle Island with her. I also got The Red Herring Mystery, but we haven't solved this one yet, and we've gotten away from this. I want to work up to The Eleventh Hour, though. It looks as though Graeme Base has other books as well, which we'll have to check out. My stepdaughter is incredibly smart, and she's eight years old now, and she loves these kind of puzzles. She also REALLY relishes anything that she can do with one of her parents (and yes, I count as one of them - she really digs me these days, which is TOTALLY AWESOME! I get to really be a mom, YAY!).

Anyway, "Masquerade" in Hardback in Good condition is selling for a penny for $3.99 shipping, so I bought a copy. Looks good. :) I'm all for things like this!

The 11th Hour by Graeme Base

Read The Eleventh Hour.