A car crashes, an expensive drill goes missing, systematic theft occurs in the department store, a murder happens. Police officer Wäckerli has his hands full and eventually even finds himself in mortal danger.

War mobilization in 1939: the clumsy Läppli, a loudmouth and busybody, is imprisoned for anti-military speeches. When he is later promoted to officer's orderly, he continues his mischievous behavior. He acts without suspicion, comes across as slightly dim-witted, a silly simpleton, talks nonsense and, in his harmless naivety, repeatedly creates situations that make us laugh at the malice of chance or stubborn militarism. His environment, the officers' staff area, is portrayed with irony, but without malicious scorn.