Due to a large backlog, Unbound are pausing accepting all unsolicited book submissions from 1st November 2019, and will be reviewing this in February 2020. During this time the online submissions form on the Unbound website will be closed.
Unbound will still be reviewing book ideas submitted prior to 1st November 2019. So if you have already submitted a book idea but are waiting for a response, you should hear the outcome in due course. You can also check the status of your submission over in your account here.
If you have started to submit a draft book idea, but this is still in draft form you have until 1st December 2019 to complete this and Unbound will review your submission.