Anthony Horowitz is one of the most versatile crime writers alive. He created and wrote Midsomer Murders and Foyle's War for television, wrote the authorized continuation of the James Bond series (Trigger Mortis, Forever and a Day), and was entrusted by the Conan Doyle estate to write new Sherlock Holmes novels. He has his own adult mystery series with Hawthorne and Horowitz, in which he appears as a character. Oh, and he wrote the Alex Rider spy series, which has sold over 24 million copies and been adapted for Amazon Prime. He is, by any reasonable measure, a machine.
The Magpie Murders series, which began in 2016, is his most sophisticated work: a mystery-within-a-mystery in which an editor reads a manuscript that may contain a real murder hidden in the fiction. It is one of the cleverest structural concepts in recent crime writing and absolutely delivers on its premise. If you want to understand what Horowitz is capable of at his ceiling, start with Magpie Murders. If you have a young reader in the house, start them on Alex Rider immediately — it's the best spy series in children's literature.
The spy series for young readers (and many adults) that introduced a generation to the genre. Alex is a teenage spy recruited by MI6 after his uncle is killed. Each book is a self-contained mission.
A mystery-within-a-mystery: a fictional 1950s detective story conceals a real-world murder. Horowitz at his most structurally ambitious. All three books are standalones within the series.
Horowitz writes himself as a character — a crime writer partnered with a brilliant, abrasive detective named Hawthorne. Very much in the Conan Doyle tradition.