Proceed with Caution is a 1937 detective novel by John Rhode, the pen name of the British writer Cecil Street.

[1][2] It is the twenty-seventh in his long-running series of novels featuring Lancelot Priestley, a Golden Age armchair detective.

It was published in the United States the same year by Dodd Mead under the alternative title Body Unidentified.

[3] Superintendent Hanslet and Inspector Waghorn of Scotland Yard respectively investigate a diamond robbery and a suspicious death.

Punshon writing in The Guardian felt " If only Mr. Rhode were a little more careful with his characterisation, if only his literary style were a little less pedestrian, he would take an even higher place than that his persistent—and consistent—ingenuity has won for him.