The second book of the Dunnersley Chronicles: 'The Hidden of Dunnersley' will be absolutely free for a short time only!
If I understand Amazon KDP Select at all (and their strange Pacific time-zones) then the promotion will start at
12.00 AM PST on the 12th APRIL.
For those of you using the trusty Greenwich Mean-Time then (I think) that will translate as about 8 AM 12th of APRIL.
The free-day lasts, quite unsurprisingly for 24 hours only and will finish at 12.00 AM or 8 AM the following day.