The Complete Guide to Becoming A Detective and Criminal Investigator
The honest, numbers-based guide to the pay, path, and daily reality of detective work — so you can decide if it's truly for you before you invest years and tuition
by Alumigogo Books
non-fiction
What detectives actually do all day, what it pays, how to break in — and the honest truth about whether you're cut out for it.
About this book
If you've been drawn to detective work by true-crime podcasts or TV shows, you deserve better than a fantasy. This guide walks you through the real job: the 70% of your time spent on documentation and digital evidence, the relationships with patrol officers and prosecutors that make or break cases, and the starting salaries that might surprise you — in a good or bad way, depending on your expectations.
You'll get a grounded self-assessment to check your own temperament against the actual demands of the role, a comparison of every realistic entry path (from a four-year degree to police academy to lateral moves from adjacent careers) with real costs and timelines, and a brutally honest day-in-the-life chapter that shows the shift from 2 AM crime scene to 9 AM status meetings. No vague inspiration — just the numbers, the barriers, and the breakthrough moments that keep investigators going on the exhausting days.
Written like a career counselor who has done ride-alongs and debriefs with homicide and fraud detectives, this guide ends with a realistic preview of where the career ceiling sits, what specializations pay more, and the most common questions people ask before committing — all so you can make a decision with your eyes open, not your imagination.
Reader Reviews
Angela Young
★★★★★I'm a junior in college weighing criminal justice versus something safer, and this guide made me realize I wasn't prepared for how much paperwork is involved. The chapter on daily work was eye-opening — I had no idea that most of an investigator's time is on computers and reports, not interrogations. It didn't scare me off, but it definitely reset my expectations. Worth reading before you pick a major.
Angela Flores
★★★★★As a career-changer from corporate compliance, I needed hard numbers, not fluff. The salary tables and timeline comparisons were exactly what I was hunting for, and the self-assessment checklist in chapter two convinced me I actually have the right temperament for this work. The chapter on getting your first job gave me a concrete plan I've already started executing. Best money I've spent on career research.
Kevin Taylor
★★★★★Decent information, but I felt the day-in-the-life chapter leaned a little heavy on the mundane side. I get that it's supposed to be honest, but I finished wondering if any detective actually enjoys their job. The salary data was useful, and the chapter on advancement was solid, but the tone got a bit dry in the middle sections. Good for research, not exactly a page-turner.
Thomas Thomas
★★★★★I've been a patrol officer for five years thinking about making the jump to investigations, and this guide gave me a realistic view of what I'd be signing up for. The breakdown of who you work with — prosecutors, forensic techs, uniform officers — was accurate based on what I've seen on the job. The self-assessment confirmed my strengths and showed me the gaps I need to work on before applying. Solid, practical resource.
William White
★★★★★I appreciated the honesty about how competitive federal investigator jobs are, but I wish the book had spent more time on private investigator work, since that's more accessible for someone like me without a law enforcement background. What was there was good — the education paths were clearly laid out — but I felt the private sector options deserved more than a few paragraphs. Helpful, just not everything I needed.
Jonathan Johnson
★★★★★Straightforward and helpful reference, though not exactly inspiring. The chapter on breaking in was the most useful to me — the interview questions were realistic and the advice on networking with current investigators was practical. I would've liked more real-world anecdotes from actual cases, but as a practical guide for decision-making, this does its job. I referenced it twice while writing my applications.