Dan Willis’s Alex Lockerby series of urban fantasy/mysteries grows more intriguing as one reads on. The fourth installment is Mind Games, in which many puzzles are solved and puzzlier ones appear.

Alex operates as a runewright/private eye in a 1930s New York where magic is the main technology. In Mind Games, a rich couple ask him to find their daughter, who has gone missing. Alex uses a finding rune to locate her in a nightclub, but the owner says she’s with him and they’re going to be married. The girl agrees that’s true, so Alex leaves them alone. But the next day she calls the police for rescue.

There’s also a young man who asks Alex to prove his wife didn’t murder her lover. In fact, he says, his wife didn’t even know the man she was arrested for shooting to death. Alex assumes he’s just in denial, but in fact there’s no evidence she even knew the guy. So why would she kill him?

Meanwhile, a number of the lower-level runewrights who operate from street carts have started working for a company that’s mass-producing runes in a way Alex had always assumed impossible. And homeless people are disappearing altogether.

And then there’s the little problem that Alex gave up the majority of his life force while saving the city, a few adventures back. His energy clock is running down, and his friend and mentor Iggy is working feverishly to create a life-extension rune for him.

As Alex Lockerby’s world develops over the course of the books, it grows increasingly interesting. I especially like the chemistry between Alex and Sorsha Kincaid, New York’s foremost sorceress. She’s beautiful, rich, highly dangerous, and a denizen of the highest society, while Alex is a lowly P.I. But there are sparks between them, and she’s learning to respect him. You can’t help wondering what comes next.

The prose is pretty ordinary, but the storytelling and world-building are excellent. And the characters aren’t bad. I’m enjoying the ongoing series.