Dorothy L. Sayers' Lord Peter Wimsey books are diverting detective fiction, set in a 20s and 30s England in which an aristocrat who is much less silly than he sometimes pretends to be goes about solving well-thought-out literary puzzle mysteries. As the saying goes, if Lord Peter did not exist, we would have to invent him.
Strong Poison marks the introduction of Ms. Sayers' love interest for Lord Peter, Harriet Vane. Ms. Vane, a curious mix of 19th Century ideas and 20s era feminism, is a mystery writer (and, in this volume, accused murderess) in her own right.
Apparently, some of those folks they call "purists" took a dislike to Ms. Vane, much preferring Lord Peter to be assisted only by his Jeeves-like gentleman's gentleman, Bunter. In fact, Sayers' Harriet Vane is a thorough delight.
This book is the first of a set of subplots in a love story notable for the fact that its heroine is frequently described as "not pretty", the affair is one of the head as well as heart, and the enchanting quirkiness of the couple makes the chase a bit winding but the result inevitable.
Is the plot a bit of whimsy? Absolutely. But, after all, it is Lord Peter Wimsey, and that makes it all come out right.
If you've not read this, I strongly recommend. If you have read this, take a good afternoon, and return to the Wimsey/Vane world.