Mr Campion's Falcon (Albert Campion, #21)

Matthew Matthews, archaeologist, died of a heart attack. Francis Makepeace, geologist, vanishes. Many problems — not least for Mr Campion. For Makepeace is a maverick with a secret. The results are murder, kidnapping, and the doghouse for his loyal friends who are the last to solve his mystery. But fortunately for them, Albert Campion is just one jump ahead of the sinister forces who can smell money — lots of money — in his disappearance and who will stop at nothing to get it under their grubby paws.

All books in the Albert Campion series are standalone titles and can be read in any order.