For the month of April Kobo has a mystery/thriller buy one, get one promotion and the first three books in the Maggie May and Miss Fancypants mysteries series are included. So if you haven’t read them yet, now might be a good chance to get one for free.
And if you have, plenty of other excellent mystery/thriller titles to choose from.
The promotion is in the US, UK, Australia, New Zealand, and Canada. Here are the links:
New Zealand: https://kobo.com/p/aprilthrillsnz