Chip and Haig take the case of a stripper/ichthyologist who had several prize fish murdered -- but of course real murder is lurking around the corner as well. I haven't read other books in this series, but this is a straight-up Nero Wolfe pastiche, and Block does a credible job with it.
Well, call it a Wolfe book for the Swinging Seventies. So some things that Stout always breezed past are focused on (sex, basically, but also some emotional stuff) and the setting is of course somewhat grittier/hippier (seedy strip clubs, health food stores, etc.). His Wolfe stand-in wants to be a famous private detective (I actually found the self-referential stuff wince-inducing, but then I've never liked such things), his Archie Goodwin stand-in is truly just a kid (well, a teenager), his staff is replaced by a mysterious Asian...but it's still basically Nero Wolfe in the Seventies.
Whether or not you like that idea will determine whether or not you like this. I'm a big fan of the Rex Stout/Nero Wolfe books and so rather enjoyed it, myself. But like a lot of Block it's very light, and here in particular you really got to buy in to the premise to enjoy it. If you can, though, you probably will.