Cockatiels at Seven by Donna Andrews.
The 8th Meg Lanslow mystery is classic Andrews. Her old friend Karen leaves her toddler with Meg for "a few hours", and disappears for several days. Meg, who is conflicted about the idea of having children, is not prepared for this, and enlists the help of her many family members.
It turns out that Karen is in some sort of trouble, and needed a safe place to leave Timmy while she worked out what to do. Of course, Meg is happy to help investigate, and solve the problem, which (of course) turns out to be extremely complex.
I really enjoy Andrews' writing her characters. We don't see as much of the extended family as usual; this is more of a Meg and Michael story, not a bad thing at all.