...and with some editing could really be great.
There were times when the writing was confused. For example, this sentence:
"Lincoln's saying goodbye to Uncle Blake. He's headed out of town for a couple of weeks to work on a high-profile case."
At first reading, and since it was so early in the book and I wasn't overly familiar with the characters yet, I was confused whether it was Lincoln or Uncle Blake that was going out of town. This is because of the confusing writing style.
Then we get to the second chapter and my confusion intensifies. Why? Because there's an extremely brief sentence about the three kids missing their opportunity to audition and now, apparently, they are wandering around Pier 39 in San Francisco trying to think of ways to earn money for food. Um...what happened to the parents that drove them there? How old are these kids again? So...they're going to sing for their supper?
Then the three are talking to a stranger who's purportedly with the very competition they wanted to participate in. Again, I ask, what happened to the parents that drove them there? Then finally, the parents appear.
Overall, it's a cute story, with the potential to be really good with help from a good editor and especially fixing some holes in the plot. There's a lot of holes that need filling. Again, there's also sentence structure issues that make it confusing also. The dialogue was good and the character interaction was not bad at all.