Donald Crankshaw has thoughts on book contracts. Because he signed one.
“What happens if the publisher ends up not publishing the work after all? That’s why you need a reversion of rights clause. This isn’t as important if the term of the rights starts as soon as the contract is signed, but if it doesn’t start until the book is published, or that term is particularly long, that could be a problem if the publisher never gets around to publishing your book. You’ll want the rights to return to you so you can try somewhere else. You should make sure that the reversion of rights clause names a time period, rather than saying it occurs when the publisher decides not to publish, since that can allow them to sit on your book for years.” — Book contract
Congratulations and best wishes! I look forward to reading Heirs of Fire by Donald S. Crankshaw.