The Fifth Bandit: Spider Heist Thrillers, Book 4

The Fifth Bandit: Spider Heist Thrillers, Book 4 by Jason Kasper

The heist team goes to Seattle. They start by meeting with their number one fan who has been purchasing their memorabilia. After the meeting, they realize that she is actually "the mentor" who they have been hunting. This realization comes just in time for them to abandon their base before they are compromised. They then hatch a few plans to infiltrate the mentor. They sink her yacht in lake Washington. They later infiltrate her compound by tunneling underneath it via Lake Washington. In the end, the mentor's evil doings are unearthed for the authorities to convict. This brings the Sky Thieves series to a nice conclusion, while leaving enough of an opening for a sequel. The Seattle location is fairly accurately detailed, but the plot does get a bit confusing.