Before we dive into the ‘Where was Richard Castle’ mystery, let’s get into the murder of the week. What’s a good Castle episode without a great murder mystery to solve and in “Montreal,” we get a good one. Not that murder is good but this is a juicy case and not just because they find the body of Wally Williger in the water. Wally was the CEO of a toy company and the investigation leads Beckett and Castle to his office to make inquiries. Toys and Castle equal SQUIRREL! Yeah, while Beckett is doing her job asking questions, Castle is playing with all the toys.