I just finished watching Citadel, a series on amazon prime and it was definitely a good watch(7.5/10). If you're into investigation , spy, crime , drama, all that fun stuff then you may enjoy this.
Another one series is the Mentalist. This was such a fun watch (8/10). Nothing much to say other than that. Same type of vibe like citadel with the investigation and all but i found the relationship between Patrick Jane and Red John quite intriguing.