I've come across a few pages talking about 'Submitting To Three Alphas' across fan communities, and the short version is that it isn't a traditionally published book with a single famous author — it's most commonly a self-published piece (often posted under a pen name) on fanfiction and indie fiction platforms. Different uploads can credit different usernames, so if you're hunting for a single canonical author you'll often find a username or pen name attached rather than a mainstream publisher. That said, many readers treat one popular version on those sites as the go-to rendition.
Synopsis-wise, the story centers on a central protagonist who becomes entangled with three dominant alpha-type characters. The narrative leans hard into polyamorous/romantic tension: initial mistrust, negotiated boundaries, jealousy arcs, and emotional growth. Expect explicit scenes, consent-heavy negotiations, and a slow-burn transition from power-play dynamics to mutual care and found-family resolution. Themes include identity, vulnerability behind bravado, and learning to communicate. I found it a messy, intoxicating read — not for everyone, but it definitely sparks conversations in the communities I've lurked in.