Wyatt is on the run. Everyone is looking for him following the mess-up of his failed attempt to hijack the armored car. He’s determined, in the meantime to get the money back from those who stole it from him (as told in Wyatt #2). As seems to be his lot, others have the same idea and he can trust no one.
The Wyatt series was written before his police procedural series features Hal Challis, a very different character from Wyatt who remains one of the more hard-bitten and amoral anti-heroes I’ve read. There’s very little humor here, just the struggles of a man who wants nothing more than to have his place in the country where he can hold up and rob a few banks every year. He has no interests, few needs or goals and in less capable hands the books would descend into mere shoot-em-ups. Disher instead has created a memorable character. If you like Westlake’s Parker (written under the name Richard Stark), or Collins' Quarry, you’ll devour the Wyatt series. On to #4.